One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

Climb right into the heart of this colorful Iceland volcano.

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

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

Bohemian paradise covered in majestic forests.

Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

This hidden art nouveau gem was designed by an architect in search of a national style.

A gargantuan crystal kingdom.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

This massive Trojan ursine was built to be a new tourist symbol for a small Swedish town.

The world's northernmost ice hotel.

A house carved into a rock in the 1940s.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

These delicate sand pyramids look like naturally occurring gothic spires.

This Shetland Islands bus shelter may be small, but it squeezes in a couch, a desk, some art, and even an old telly.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

This geothermal hot spring hides beneath a slowly growing mineral dome.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.