The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The largest salt lake in the Sahara is mysteriously alluring.

Geothermal resources are cooled in this oddly-shaped structure before being used for irrigation

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

Founded in 670, this ancient mosque is an architectural time portal.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Ancient rock-hewn town that witnessed key events of Georgian history.

A museum glorifying the life of Stalin, located in the city of his birth.

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

Unusual building appears to be haphazardly built from randomly piled bricks.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.