The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Over the course of its history, this tiny island has held enslaved people in transit and served as a quarantine zone. Today, it's a giant tortoise sanctuary.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

The culture that built these Tanzanian ruins displayed advanced knowledge of irrigation technology before mysteriously disappearing.

This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

Human ancestor’s 3.6 million year-old footprints.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

Sitting atop a rock on Michamvi Pingwe beach, this restaurant becomes its own island at high tide.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

Few of the many visitors to this resort town know of its hidden Maya ruins.

A breathtaking viewing platform over the Alps.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

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

Khmer Rouge's high security prison.

The largest mosque in Cambodia was built to unite the country's Muslim community but soon sparked division and controversy instead.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

One of Vietnam's only mosques pays tribute to the country's Muslim minority.

This historic spot was where America's involvement in the Vietnam War officially came to an end.

A sculpture park that takes the use of clay to a whole new level.

An ornate tomb pays tribute to one of the most influential and cherished military leaders in Vietnam's history.