A number of other Moorish remnants are still visible in Gibraltar today. A "hamam" or bath-house, similar to examples in Fez in Morocco, was built in the lower town; its remnants can still be seen today incorporated into the Gibraltar Museum. It was built using Roman and Visigothic capitals, perhaps salvaged from the nearby ruined city of Carteia. The bath-house may have been part of the Moorish governor's house. A mosque was built in the city centre and was later converted by the Spanish into a Catholic church (now the Cathedral of St. Mary the Crowned). A small mosque was built near Europa Point at the southern tip of Gibraltar and was later converted into the Christian Shrine of Our Lady of Europe. A subterranean reservoir, now known as the Nun's Well, was also built at Europa Point for the supply of water to the city. An existing 12th-century wall along the sea shore was extended to Europa Point to block access to places where landings could be made by sea. Much of the remainder of Moorish Gibraltar was obliterated by the destruction caused by the Great Siege of Gibraltar in 1779–83 and is now buried below the strengthened fortifications and rebuilding implemented by the British afterwards.