Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

The longest hedge maze in the world.

This Ecuadorian cemetery is home to a jaw-dropping topiary wonderland.

A dangling church built over a Colombian gorge.

A 16th-century horror show built in a lovely Italian garden.

This 16th-century monastery has been turned into a surrealist architecture compound.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

Walk in the footsteps of the gods and straddle two tectonic plates.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Climb right into the heart of this colorful Iceland volcano.

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

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Rising from the sea like a stone monster.

Three million year old fossils are exposed for all to see on this Icelandic shore.

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

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

A marvel of Byzantine engineering under the streets of Istanbul.