One of the largest, oldest, darkest, quietest motel rooms in the world.

A Saint Nicholas-themed ghost town in the Mojave desert.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A reproduction of earth's many biomes.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Dramatic river bend surrounds a natural red-rocked pedestal.

A beautiful example of 18th-century engineering still standing tall.

This feature of the city's aqueduct has achieved numismatic fame thanks to its appearance on Mexican banknotes.

In a busy Oaxaca market, a nearly century-old drinks stand still serves family recipes from giant clay pots.

This immense scene of a cosmic battle between a jaguar and serpent illustrates the Aztec concept of the duality of life.

Hidden for more than a century, the grave of the Conquistador remains forgotten behind these church walls.

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.

A coastal monument honors one of Mexico's most notable immigrant groups.

This palatial building has lived many lives as a convent, prison, cultural center, state archives, and government offices.

It was dubbed the "Garden of Plates" because it's covered in pieces of discarded dishes.

This highly decorated dam is one of Guanajuato's most unexpectedly beautiful public works.

This historic Mexican convent is home to a tree that grows crucifix-like thorns.

The remains of a centuries-old water system that inspired local legends of secret tunnels.

This baroque wonder is filled with a trove of artistic treasures.

The world's first museum of its kind is packed with nostalgic relics of the past.

A hidden room within the church displays an amazing collection of old choir books.

One of the city's most imposing Neoclassical buildings is also one of its most prestigious schools.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.