<human>:  I have a question about the Construction of the Sagrada Familia. What is the difference between a spire and a tower?
<bot>: A spire is a tall thin structure that sticks out from the top of a building. A tower is a tall structure that sticks out from the side of a building. The Sagrada Familia is a church in Barcelona, Spain, that is being built by Antoni Gaudi. The church is famous for its spires and towers.