This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

The first public library in the Americas has more than 45,000 books dating back to the 15th century.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

The former headquarters of Mexico's Secretariat of Public Education now houses a muralism museum, including Diego Rivera's first large-scale mural project.

The most complete statue of this Aztec god sits a top a throne carved with images of hallucinogenic plants.

A grand entrance to one of the world's smallest Chinatowns.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

Site of the largest volcanic eruption in the last 25 million years, one which may have nearly wiped out humanity altogether.

Think you have a tough job? Try carrying 200 kilos through a cloud of sulfur down the side of a volcano.

Built by the Portuguese colonists in the early 16th century, this fort is one of the oldest European structure in Asia.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The monster at the center of the Darwin Center Spirit Collection.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A subterranean house of worship carved right out of the bedrock.