More can be read about La Sagrada Familia on its Wikipedia page by clicking here.
Carrie and I went to visit La Sagrada Familia one morning and she purchased tickets for us online ahead of time to go up to the top of one side... we went up the top of the Nativity facade. It was well worth the elevator ride up top and the narrowly winding staircase down... the views were phenomenal and so is this structure.
Our first view of Sagrada Familia walking up the street:
The Nativity facade: