Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

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

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

Extraordinary sculpture garden created by an eccentric English poet.

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

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The enormous appendage offers spectacular views of Colombia's Huila Department.

The centuries-old trees are draped with Spanish moss to make them look like wizened elders.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

A magical world of elves and fairies tucked amongst the trees in Colombia.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

A century-old stone hermitage overlooks this remote pass in the Hoggar mountains, surrounded by a landscape of eroded volcanic cores.

One of the best-preserved impact craters on the planet is located in the middle of the Sahara Desert.

An abandoned film set location for a remote spaceport in a galaxy far, far away hides in the Tunisian desert.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Turntable anonymously received orphans, alms, and groceries.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.