The Templo Expiatorio del Santísimo Sacramento is a Gothic church that first opened its doors in 1897. It's defined by large stone pillars and equally enormous stained-glass windows. If you're passing by at 9 a.m., noon and 6 p.m., you'll witness 12 apostles process out through a door in the clock tower – just like clockwork. 

Recent visitors called this church "an amazing piece of art" and a must-see. Others recommend planning your visit on weekend afternoons when the plaza around the church fills with vendors selling delicious foods, such as strawberry and pineapple tamales. 

The temple, which is free to visit, is open from 7 a.m. to 11 p.m. daily.