The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

This bone-filled cave got its name after they found 140 bear skeletons inside.

This once-derelict building is now one of the most beautiful bookstores in the world.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This massive underground salt mine now holds a sci-fi theme park in its depths.

A charmingly eccentric magma chaser presents his complete history of the island's eruptions since 1947, in cinematic form, just for you.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

The summer tourists on these cliffs are thousands of seabirds.

The largest whale museum in Europe allows visitors to walk among life-size giants.

A winding, blood-red tunnel of hardened lava navigable by foot.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

An encyclopedic collection of mammal penises.

Staves, storm-calling, and of course, necropants.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

This Manchester laundromat is hiding something.

Built after the 1991 discovery of one of the world's most complete T.rex skeletons in the nearby hills.

As if T-rex wasn't big enough, this Canadian monument is four times larger than the real thing.

Locals transformed this Canadian evergreen into a secret hangout with spectacular views of Vancouver's skyline.

While these wooden totems bear a striking resemblance to First Nations artwork of British Columbia, their actual origins lay on the opposite side of the Pacific Ocean.

Housing a morgue, rare and confiscated weapons, and autopsy remains, the Vancouver police museum displays the dark side of Canada.

The water swaps direction twice a day, whipping into a frenzy of whirlpools and rapids.

The remains of a Canadian train crash are now mouldering beneath layers of rust and graffiti.