Mexico City's residents are being watched by this state surveillance headquarters, designed by architects with a flair for intimidation.

The winter home of millions of migrating monarch butterflies.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

Twelve natural mummies are displayed in the crypt of this former monastery school.

Frida Kahlo's childhood home, now a museum of her life and works.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

66,000 pieces of art, donated by one of the world's richest men.

Diego Rivera's massive tiled fountain and failed infrastructure project.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Part bookstore, part café, and part forest.

The only castle in North America to ever house European sovereigns.

This fantastical house shaped like a seashell brings aquatic design to architecture.

An Aztec snake god has taken the material form of an apartment complex.

Stained glass windows bathe this botanical garden in cosmic light.

This ceremonial Mexican square looks as though it belongs in a science fiction movie.

Mexico's astounding mummy museum with "the world's smallest mummy."