This derelict superstructure was a very important warning system for the Soviet military.

The biblical sculpture honors those who lost their lives, homes and communities to the Chernobyl disaster.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

This was once the center of the Birdman cult, and is now a World Heritage Site.

The ominously named cave is home to some remarkable ancient art.

The world's most remote airport.

The largest stone moai on Rapa Nui.

These tiny statues form a terracotta army from China's Han dynasty.

The once highest point in China blends symbolic design with a kick of adrenaline.

The most famous location in China was home to whole dynasties worth of imperial rulers.

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

A battle between nature and architecture in the Cambodian jungle.

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

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

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

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

Mysterious hillside with a continuously burning natural fire.

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

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

Nelson Mandela lived here with his family from 1946 until his arrest in 1962.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.