Casa Mila - Antoni Gaudi - Great Buildings Architecture Another one of Antonio Gaudí's creations once again hits the top 10 most visited attractions in Barcelona. This building used to be called Casa Mila but nowadays it's more commonly known as La Pedrera which means "quarry". Gaudí was instrumental in completing this building and his characteristic wavy brick work and colourful tiles are also evident on this masterpiece.
A series of manholes and ladders lead visitors to the creepy catacombs of Paris. In 1786, the cemeteries of Paris churches were filled to overflowing. The government saw a solution in long-abandoned stone quarries in and around the capital. The resulting catacombs eventually became the final resting place of some 6 million people. Following a vandalism incident, the catacombs were closed to the public in September 2009, but reopened a few months later.