Nature's slip and slide.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Handcrafted thermal spa washes away each night with the tide.

Not a single witness can attest to the creation of the world's largest geoglyph.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Ella Fitzgerald, opera singer Enrico Caruso, and dancer Isadora Duncan all performed in this lavish, supposedly haunted theater.

Bioluminescent firefly squid light up this Japanese fishing port.

Malaysian fireflies create a dazzling display as thousands light up in unison.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Wander among the abandoned ruins of this once-powerful medieval town.

An eccentric inventor's castle home with its own indoor weather system.

Landbridge created by the South Korean version of Moses.

Was the ravaging reptilian that terrorized this village a dragon, or an escapee from a London menagerie?

Roman ruins top white travertine terraces formed by ancient hot springs.

Centuries-old bridges grown from tangled roots.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

Designed to serve primarily the Maharaja, this is an interesting variation on the traditional stepped well.

Just a man taking his prehistoric pet for a stroll.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

The small sanctuaries lie just off the beaten path near one of Bhutan's most famous attractions.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Lebanese castle built by one man, over a lifetime.