The largest manmade caves in Europe now function as a motorbike club's headquarters.

An abandoned stretch of elevated road in the middle of the Brazilian jungle.

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

Play everything you see at a museum dedicated to a town's historic organ industry.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

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

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This museum shines a light on the true Pilgrim experience in North America.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

Centuries-old hoofprints and wagon tracks reveal themselves after a good winter storm.

This beautiful Cape Cod beach offers dazzling views and an interesting historical footnote.

A regular looking rock with an unbelievable history.

This small New York museum celebrates the mountainous artwork of a Russian mystic.

This sculpture forces visitors to confront their relationship with space.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

The country home of world-famous designer, writer, and artist extraordinaire, William Morris.

Described by William Wordsworth as a "World of Wonder."

Mark Twain once stopped at this rest station during his journey to Nevada.

Saved by a logger, this Douglas fir is one of the last great old-growth trees in Canada.

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

Ancient indigenous sculptures steeped in history and shrouded in mystery.