Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.

This impressive clifftop temple was once at the center of an international custody dispute.

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

A battle between nature and architecture in the Cambodian jungle.

Look up as you explore Baku’s old town to find a monument to the local feline population.

A massive collection of petroglyphs dating back some 40,000 years.

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

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

Resonant stone, that has been played since prehistoric times.

A gigantic collection of teeny, tiny books.

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

Mysterious hillside with a continuously burning natural fire.

A large replica of a monumental Roman inscription is located on the side of this museum.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This ancient market is often referred to as the oldest shopping mall in the world.

A monument dedicated to a lone, brave invader.

The first modernist church in Europe.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

An ornate private entrance to the Vienna subway built specifically for the emperor.

This museum is dedicated to the little known ancient Roman history of Vienna.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

A magnificent collection of imperial armor and weaponry.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.