Sukhumi houses a number of historical monuments, notably the Besleti Bridge built during the reign of queen Tamar of Georgia in the 12th century. It also retains visible vestiges of the defunct monuments, including the Roman walls, the medieval Castle of Bagrat, several towers of the Kelasuri Wall, also known as Great Abkhazian Wall, constructed between 1628 and 1653 by Levan II Dadiani to protect his fiefdom from the Abkhaz tribes; the 14th-century Genoese fort and the 18th-century Ottoman fortress. The 11th century Kamani Monastery ( from Sukhumi) is erected, according to tradition, over the tomb of Saint John Chrysostom. Some  from Sukhumi lies New Athos with the ruins of the medieval city of Anacopia. The Neo-Byzantine New Athos Monastery was constructed here in the 1880s on behest of Tsar Alexander III of Russia.