The extremely grey columns of one of Mexico City's most iconic beltways are slowly gaining a bit of color.

The collection of intricate sculptures includes one carved from a mammoth's tusk

A "time traveler's" vision of human history stretches throughout Mexico City's Copilco metro station.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

Part bookstore, part café, and part forest.