Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

An ancient Egyptian temple in the middle of Madrid, Spain.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

Mysterious standing stone formations looks like a petrified forest.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

This art installation pays homage to the famed stones of European lore.

A Serbian church lit by chandeliers made of weapons.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

A fearsome dragon clings to a corner of Munich's city hall.

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

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

A statue dedicated to the founders of communism.