The Basilique du Sacré-Coeur is a century-old Roman Catholic church that was designed in a Romano-Byzantine style by French architect Paul Abadie (1812-1884). Standing at 83 metres high (272 feet), the church was constructed using travertine - a type of limestone - which ensures that the structure maintains its white colour. The dome at the top of the church is accessible to tourists and it costs approximately 5 Euros to climb 300 steps to the top of it, which is the second-highest point in Paris after the Eiffel Tower