The plan for Sagrada Familia, laid down by Antoni Gaudi, was truly ahead of its time. Gaudi’s original vision for the towers includes 18 spires, to represent the Twelve Apostles, Virgin Mary, the four Evangelists, and Jesus Christ. Of the 18, only 8 spires have been completed so far. These correspond to the four Apostles of the Nativity Façade and the four Apostles of the Passion Façade.
The spires dedicated to the Evangelists will be surmounted by sculptures of their traditional symbols while the tallest spire, dedicated to Jesus Christ, will be surmounted by a giant cross and will have a height of 170 meters (560 ft). While the towers are a long way from completion, once completed they will make Sagrada Familia the tallest church building in the world. You'll need to purchase a special access ticket to visit Sagrada Familia towers where you can choose to climb either the Nativity or Passion towers.