This triumphal arch is the only fully standing structure that remains from Roman-era Oea.

Nature’s skyscraper launches out of the terrain with attitude.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

The first skyscraper to include a Ferris wheel built into the facade.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A massive collection of petroglyphs dating back some 40,000 years.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A unique museum dedicated to culture and artistry of carpet weaving.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

Mysterious hillside with a continuously burning natural fire.

A shrine of fire worship built on top of a natural flame.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

This Himalayan airport provides one of the most difficult landings in the world.

An abandoned colonial French prison notorious for its hellish conditions.

The end appears to be nigh for the world's fourth-longest floating bridge.

The largest market in Guyana, designed and built by the Edge Moor Iron Company of Delaware.

Though dynamited and defaced, the statue still stands outside the law courts in Georgetown, Guyana.

Georgetown’s most impressive building is also one of the tallest wooden churches in the world.

The world's widest single drop waterfall, and the two men who legend says went over its edge in a boat.

This former shopping center now acts as the eccentric lair of the Venezuelan secret police and their shadow prison.

Lived-in building, bedecked with an astonishing array of mirror mosaics.

Kuwait City's uniquely designed water towers look straight out of a retro sci-fi cityscape.

Wander among the ghostly ruins of an island where civilization flourished for thousands of years.