One-of-a-kind stupa in Laos.

This mysterious tower is said to enshrine a dormant seven-headed serpent that once protected Vientiane from destruction.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

Khmer Rouge's high security prison.

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

A palace destined to never house a king.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

A quick and simple solution to Cambodia's train woes.

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.

This fort dates back to 1588 and was colonized by the Portuguese, Dutch, and English and sits prominently on the Indian Ocean where azure water lap the coast.

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This elaborate temple was built around one of the Buddha's teeth.

This ancient cave temple complex is the largest and best-preserved temple complex in Sri Lanka.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

The remains of what was, not so long ago, the world's largest city.

Modest by day, illuminated majestically at sunset.

This ancient Hindu temple is covered in thousands of colorful statues and has a long mythological history.

A bulky, ancient stupa marks the site of Siddhartha Gautama's seminal Buddhist teaching.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.