Harder layers in colorful sandstone weather out as prominent “fins" and even more intricate and bizarre shapes.

Water of undetermined depth has attracted rare fish and cult leaders alike.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

The contents of this safe survived a 37-kiloton nuclear bomb.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

This Stonehenge-inspired solar calendar stands alongside a landfill, in the middle of the Nevada desert.

A hidden slot canyon in the southern Nevada desert makes an unexpected oasis and scenic hike.

This former open-pit manganese mine is now a massive graffiti canvas.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An underwater road considered a possible Atlantis location.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

Nature took her revenge on the "Wickedest City in the World."

A stunning Victorian abbey and walled garden on a lakefront.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A granite plane marks the site where a French aviator completed the first airplane flight across the English channel.

A spiral staircase twists to the top of this unusual Czech lookout tower.

An elaborate Romanesque archway, built right before the British occupation of Ireland.

Originally built as a promotional giveaway, this suburban house was designed to be an IRL version of the Simpson home.

Temporary Burning Man sculpture made of two 18-wheelers.