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

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.

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

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

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

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

Part bookstore, part café, and part forest.

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

The former home of the famed revolutionary Pancho Villa is now a museum in his honor.

This 80-year old mannequin is so lifelike it is believed to be an embalmed corpse.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

The house's confection-like decorations are the result of one man's painstaking work over decades.

This mountain tram provides stunning views while hanging from a single, steel thread.

When life gives you Prohibition, open a bar in Juárez.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

Salute the leader of the proletariat.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

This poignant display is now a memorial to these regionally extinct species.

This taxidermy scene brings the struggle for survival in the Indian jungle to a quiet corner of a Manhattan museum.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Four cars from the old system were once on display, but were removed in 2014.