Despite the crowds this church was very peaceful and so beautiful. It almost ruins other cathedrals for you. This is the website of the Church .
I do suggest buying tickets ahead of time. Less of a line. The lines to most of Barcelona's attractions can be long and with heat not a good combination.
The Church is UNESCO world heritage, When the church is finished it will have 18 towers: 12 dedicated to the apostles, 4 to the evangelists, one to Jesus and another to Mary.
More information here
Check out the lonely pigeon!