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Old Bridge Area of the Old City of Mostar

Europe, Bosnia and Herzegovina · Cultural site · UNESCO World Heritage property #946

Moderate ConcernConfidence: Supportedas of October 14, 2026

Significance

UNESCO describes Mostar as a historic town set in a deep valley of the Neretva River, which grew in the 15th and 16th centuries as an Ottoman frontier town and expanded further under Austro-Hungarian rule in the 19th and 20th centuries. Its Old Bridge, designed by the architect Sinan, and much of the old town were destroyed in the 1990s conflict; the bridge was rebuilt in 2004 and many buildings were restored or rebuilt with the help of an international scientific committee set up by UNESCO. UNESCO presents the property as a symbol of reconciliation and coexistence of diverse communities, and its property page lists criterion (vi).

Current Status Rationale

Historical damage is documented in the site's record, but the current classification is based on present conditions and the most recent credible evidence. The Old Bridge was destroyed in 1993 and rebuilt by 2004; that history sits in the timeline. On present conditions, UNESCO's most recent periodic report found (Cycle 3, listed under 2024) records authenticity preserved, integrity intact and Outstanding Universal Value maintained, with other important values partially degraded (the report adds that the state of conservation 'has not been significantly impacted'). The Committee has not reviewed the property's state of conservation in any decision found since 2011 (the documents page lists only the 2014 retrospective statement adoption after that), and the property is not on the Danger List. Against that, there are real, documented, long-running concerns: cracks in the rebuilt bridge reported since 2007 and described as ongoing in a 2019 engineering paper, thermal deformation of the bridge noted in the periodic report, insecure funding and limited human resources, deficiencies in visitor-management implementation, and a UNESCO project page describing tourism-related strain on town infrastructure before the pandemic. These are chronic, monitored issues rather than an acute emergency, which is what Moderate Concern describes. Confidence is Supported rather than Confirmed: the facts are traceable to UNESCO documents and a professional engineering paper, but the most recent UNESCO assessment is compiled from questionnaire responses by State Party bodies rather than independently verified, no 2020s independent report on the bridge cracks was found, and several UNESCO state-of-conservation pages for recent years were not available. Confidence does not alter the status.

Conservation or other pressures are documented, but without imminent risk to the site. Credible sources support this status, with some limits on corroboration.

Threat Categories

Conservation / Structural

The principal documented structural issue is cracking of the rebuilt Old Bridge. A 2019 professional paper by Glibic, Sunjic and Mikulic (University of Mostar engineering faculty journal e-Zbornik) states that the first cracks were observed in 2007, three years after the bridge was restored in mid-2004, and that the cracking process has been ongoing since; it discusses possible causes but the abstract identifies none definitively. The World Heritage Committee's 2008 decision (32 COM 7B.85) expressed concern about cracks in the bridge structure and asked the State Party to continue monitoring them with precise indicators and to take measures to keep the bridge's width and grade stable; decision 34 COM 7B.80 (2010) and 35 COM 7B.86 (2011) noted that the Municipality of Mostar was carrying out structural monitoring. In its January 2011 report the State Party reported a visual survey, a 3D laser-scan comparison and a new reference-point system, with preliminary 2010 results showing 'the overall deformation of the bridge is minor'. The most recent UNESCO document found, Periodic Reporting Cycle 3 (listed by UNESCO under 2024, and compiled from questionnaire responses by site-level bodies, not an independent assessment), records that authenticity has been preserved, integrity is intact and Outstanding Universal Value maintained, while other important values are being partially degraded (the same section says the property's state of conservation 'has not been significantly impacted'). The same report states that existing funding sources 'are not secure', that human resources only partly meet needs, that monitoring is considerable but not directed towards management needs, and recommends improving coordination, long-term financing planning and visitor management. It also records geodetic monitoring of bridge benchmarks twice a year. Tourism pressure is documented at a general level: a UNESCO project page says rapid tourism growth strained the town's infrastructure before the pandemic, with many one-day visitors, and cites the city's 'estimated annual 1.5 million visitors' (undated page, estimate); a FENA item of 11 October 2024 is headlined 'over one million visitors' and quotes the Mostar Tourism Board director calling the past summer season 'one of the most successful to date', but its visible text does not show who gave the one-million figure or for what period (paywalled); and the Periodic Reporting document lists five visitor-number values (166129 / 120000 / 100000 / 270000 / 245000) with no year or counting-method labels. These figures use different, mostly unstated, definitions and periods and cannot be reconciled; they are read only as indications that visitation is high, and none is used to set the status. RFE/RL reported thousands of tourists at the July 2024 diving event; none of these sources documents physical damage from visitor numbers. No source reviewed documents new damage or unrepaired acute damage to the property in the last five years.

First identified: Not established — First cracks in the rebuilt bridge were observed in 2007 according to the 2019 e-Zbornik paper; the Committee referred to the cracks in 2008. Funding and visitor-management concerns are chronic, with no single start date established in the sources reviewed.

Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre, UNESCO World Heritage Centre, UNESCO World Heritage Centre, UNESCO World Heritage Centre, UNESCO World Heritage Centre, e-Zbornik, Faculty of Civil Engineering, University of Mostar (Glibic, Sunjic, Mikulic), RFE/RL (with Reuters), FENA (Federal News Agency)

Environmental / Climate

The Periodic Reporting Cycle 3 document (section 4.7.3 as retrieved) states that temperature dynamics lead to deformations of the bridge structure and that geodetic monitoring of benchmarks is carried out twice a year. The same report shows flooding as relevant, negative and potential in the earlier Cycle 2 answers (15/08/2014); the current-cycle selections for flooding were not legible in the text retrieved, so no current assessment is reported here. The only flood item found for the area is a FENA report of 6 January 2026 on the Buna and Bunica rivers overflowing near Blagaj and in Malo Polje (several buildings flooded in Malo Polje); the visible text does not mention the Old Town or Old Bridge, and the property is not shown to have been affected. This category therefore reflects a chronic, monitored thermal effect on the bridge and a flood exposure that is noted but not documented as damaging the property.

First identified: Not established — Chronic factor recorded in UNESCO Periodic Reporting; no single start date applies.

Sources: UNESCO World Heritage Centre, FENA (Federal News Agency)

Natural Disaster

Earthquake risk is described in UNESCO's Periodic Reporting Cycle 3 document (section 4.11.2 as retrieved) as a 'potential earthquake hazard' for which 'no adequate action' is recorded. The Committee's 2008 decision (32 COM 7B.85) refers to cracks in the Old Bridge structure appearing after earthquakes, as retrieved; the sources reviewed do not give details of those earthquakes. This is a potential-hazard entry in a State Party-compiled report, not documentation of a recent damaging event.

First identified: Not established — Potential hazard recorded in periodic reporting; the 2008 Committee decision refers to earlier earthquakes without dates in the text reviewed.

Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

Historical Timeline

  1. 1993-11-09
    Old Bridge collapses after shelling

    UNESCO's World Heritage magazine story states the bridge was completely destroyed in the 1990s conflict and, after relentless shelling, collapsed into the Neretva River on 9 November 1993.

    Sources: UNESCO World Heritage Centre

  2. 2004
    Old Bridge reconstruction completed; Old City declared a National Monument

    UNESCO states that work began in 1999 and continued until 2004, as a project of UNESCO, the World Bank and the city of Mostar, using stone from the same local quarry as the 16th-century bridge and 16th-century building methods (a photo caption in the same story says work on the foundations started in June 2001 and the reconstruction was finalized in 2002). ICOMOS recorded that the bridge reopened in summer 2004 and that the Old City was designated a National Monument in July 2004.

    Sources: ICOMOS (via UNESCO World Heritage Centre), UNESCO World Heritage Centre

  3. 2005-07
    Inscribed on the World Heritage List

    The property was inscribed in 2005 (UNESCO's story gives July 2005; its property page gives the year). ICOMOS had noted reservations about authenticity under the earlier test but judged the Old Bridge reconstruction to have a 'kind of truthfulness' under the 2005 guidelines, and named avoiding further alteration of the townscape as its main integrity concern.

    Sources: UNESCO World Heritage Centre, ICOMOS (via UNESCO World Heritage Centre), UNESCO World Heritage Centre

  4. 2007
    First cracks observed in the rebuilt bridge

    A 2019 paper in e-Zbornik (University of Mostar) states that the first cracks were observed in 2007 and that the cracking process has been ongoing since then.

    Sources: e-Zbornik, Faculty of Civil Engineering, University of Mostar (Glibic, Sunjic, Mikulic)

  5. 2008
    Committee decision 32 COM 7B.85 raises bridge cracks and Hotel Ruza redesign

    The Committee expressed concern about cracks in the Old Bridge structure, asked the State Party to keep monitoring them and take measures to keep the bridge's width and grade stable, and urged a redesign of the hotel under construction in the buffer area, with an update due by 1 February 2009.

    Sources: UNESCO World Heritage Centre

  6. 2010
    Committee decision 34 COM 7B.80: hotel height limit and structural monitoring

    The Committee noted that the Municipality of Mostar was monitoring the bridge's structural stability and asked that the revised hotel design allow no construction above the fifth storey, with a progress report due 1 February 2011.

    Sources: UNESCO World Heritage Centre

  7. 2011
    Committee decision 35 COM 7B.86; State Party reports on bridge monitoring

    The Committee noted ongoing structural monitoring and found the hotel redesign conformed to its 2010 decision, asking for a further report by 1 February 2013. The State Party's report of 31 January 2011 described a visual survey, a 3D laser-scan comparison, a new reference-point system and preliminary 2010 results showing minor overall deformation.

    Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

  8. 2014
    Retrospective Statement of Outstanding Universal Value adopted

    Decision 38 COM 8E lists the property among those whose Retrospective Statements of Outstanding Universal Value were adopted. The documents page lists no later Committee decision on the property.

    Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

  9. 2019-06
    Engineering paper reports ongoing cracking of the Old Bridge

    Glibic, Sunjic and Mikulic's paper in e-Zbornik No. 17 (June 2019) describes the development of the cracks and measured vertical deflection since the bridge was rebuilt, and discusses possible causes without identifying one definitively in its abstract.

    Sources: e-Zbornik, Faculty of Civil Engineering, University of Mostar (Glibic, Sunjic, Mikulic)

  10. 2024
    Periodic Reporting Cycle 3, Section II, lodged for the property

    UNESCO lists the Cycle 3 Section II report under 2024. It records authenticity preserved, integrity intact and Outstanding Universal Value maintained, other important values partially degraded (state of conservation 'not significantly impacted'), insecure funding, and recommendations on coordination, financing and visitor management. The document itself gives no submission date and does not name its submitter.

    Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

Digital Preservation Index

Overall coverage: Moderate — Documented in several categories, with some notable gaps.

Three of five categories have publicly viewable evidence, which meets the moderate tier (2-3 categories). Photographic: UNESCO's own gallery (at least 12 images on the first page, with more apparently on further pages; credited to Sinisa Sesum, Yvon Fruneau and Silvan Rehfeld). Archival: a 2004 Aga Khan Trust for Culture / World Monuments Fund brochure on the conservation of historic Mostar is downloadable and contains plans, drawings, photographs and a survey of 21 priority buildings; this is a published project record rather than a digitised archive, and a catalogue record of a c.1895-1920 photograph of the bridge from an Austrian museum collection was also found. 3D documentation is not counted: the State Party's 2011 report says 3D laser scanning was used to monitor the bridge, but no publicly viewable model was found; hobbyist 3D models appeared in search results but could not be verified and are not counted. Virtual tour is not counted: only a single user-uploaded 360 panorama from 2012 on a commercial panorama site was found, which is not an official or substantive tour. Academic: peer-reviewed radiocarbon and dendrochronological dating of the bridge, and an engineering paper on its cracks. Coverage is uneven and bridge-focused; no whole-area digital model or official virtual tour was found in this pass. UNESCO state-of-conservation and periodic reports are not counted as archival records.

Law and commitments

Sources