This massive chapel in the middle of the Indonesian forest is both haunting and fowl.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

One of the most photographed locations in the entire city.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

An abandoned Byzantine fortress and notorious prison.

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The collection of intricate sculptures includes one carved from a mammoth's tusk

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The only castle in North America to ever house European sovereigns.

66,000 pieces of art, donated by one of the world's richest men.

Frida Kahlo's childhood home, now a museum of her life and works.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

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

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

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.

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

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.