Triangular House built on a leafy residential street in St. Paul.

This striking art museum holds an amazing series of curiosity cabinets.

This abandoned prison castle has become an imposing gallery of graffiti art.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

This warehouse-gallery-shop hybrid showcases Mexican craftwork at its best.

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

A series of abstract sculptures pop up from an otherworldly volcanic landscape.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

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

The famous artist couple lived and worked here, in two different houses separated by a bridge.

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

An island filled with hundreds of hanging, decomposing, decapitated dolls.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

When ecosystems collide in the arid Southwest.

The highest bridge in America was built for an almost unnervingly small amount of money.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The only museum dedicated to the history of the "Magic Lantern," a medieval slide projector.

A collection of 100 brains preserved in jars on the UT campus.