The last and unfinished work of Gaudi, his most renowned work to which he dedicated the last years of his life. It manages to blend architecture, poetry, religion, botany, and astronomy. The construction of the building began in 1882 and Gaudi dedicated 40 years of his life to it, right up until his death in 1926. Built under the concept of an expiatory temple, the Sagrada Familia was financed immediately and exclusively by public donations, as it still is today, thanks to the donations still received by the numerous admirers of Gaudi's masterpiece. Eight of the eighteen façade bell towers, 100m high and dedicated to the Apostles, have been built. The 4 towers of the Glory façade still need to be built: the 170m high central one in honour of Jesus Christ, and Our Lady's tower (125m), and those of the 4 Evangelists. The work should be finished around 2020. The entrance to the Temple Expiatori de la Sagrada Família allows you to visit the crypt that is Gaudi's final resting place, as well as a museum where you can observe the evolution of the temple through scale models, photographs, plans, and decorative objects. The tour of the tower takes you up a vertical spiral inside a gigantic stone snail staircase. Those who are feeling brave can climb the 426 steps to the summit, where you can admire a breathtaking panorama over Barcelona. Others can take the lift. This modern cathedral, listed as a UNESCO World Heritage site, has become the symbol of Barcelona and its most visited monument.