Basilica of Our Lady of Guadalupe is the most visited Catholic site in the world, even more frequented than the Vatican. It was built in the 17th century, but the instability of the foundation made it unsafe, so a second basilica was built in the 70s by the same architect as the Archeology museum, Pedro Ramírez Vázquez. As you can see in the image below, it has a 70s vibe with the colors used and the artwork. This newer basilica houses what is known to be the original image of the Virgin of Guadalupe.
Xochimilco is like the Venice of Mexico, but with a little more fiesta, and less romance. It's BYOB on the river, so people bring booze, snacks, and boom boxes to cruise around and party in these colorful boats.
The Museum of Popular Art is a multi-level presentation of Mexican folk art, with a gorgeous glass ceiling that has artistic kites hanging down. The art here is 3D and colorful, showcasing all kinds of whimsical creatures and tales of Mexico's folkloric past.