These crumbling towers are some of the last remnants of a centuries-old Vietnamese culture.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.

A secluded, little-known temple hidden amid the dense jungle.

Vietnam's largest Buddha statue depicts a female sage.

This impressive clifftop temple was once at the center of an international custody dispute.

5,000 skulls in memorial to those killed by the Khmer Rouge.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

An ancient burial ground believed to have been used for ritual sacrifice.

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

Khmer Rouge's high security prison.

One of the biggest markets in Asia, under one of the continent's largest domes.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

A battle between nature and architecture in the Cambodian jungle.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

You can still see bits of the camouflage used to hide this Art Deco building from bombers during World War II.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A masterpiece of Art Deco architecture hidden in plain sight in West London.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

Designed by the architect who also had a hand in crafting the Westminster Abbey and Bristol Cathedral.