A bizarre custom in Europe is the building of bone houses also known as Ossuary. A bone house is a weird structure build with 40,000 to 70,000 bones and skulls. They are frequently built at places where burial space is limited. Burial space is rented on lease for 10 to 30 years and then when the lease is over the bones are used to build the bone house. What is more fascinating than creepy is that the bones are arranged in beautiful patterns.
Many examples of ossuaries are found within Europe such as the Santa Maria della Concezione dei Cappuccini in Rome, Italy, the San Bernardino alle Ossa in Milan, Italy, the Sedlec Ossuary in the Czech Republic, and Capela dos Ossos (Chapel of bones) in the city of Evora, in Portugal. A more recent example is the Douaumont ossuary in France that contains the remains of more than 130,000 French and German soldiers that fell at the Battle of Verdun during World War I.