A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Exact replica of the ancient monument, but much, much lighter.

Only known mainland rookery of the threatened Stellar sea lion.

100-year-old shipwreck you can walk up to at low tide.

The longest continuous lava tube in Oregon.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This free, take-a-book shop seems like a trick but isn't.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Quite simply the largest tree in the world (by volume).

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

Beach instrument turned bed and breakfast.

The "world's smallest volcano" has been used to store meals and dispose of dead bodies.

Giant nude woman of Tijuana is also the artist's home.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.