It houses the remains of a 17th-century version of the Titanic.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

A historic fire call point.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Berlin's old airport.

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

A fascinating insight into daily life in the Eastern Bloc.

A collection of abandoned typographic signs from Berlin and beyond.

One of the world's heaviest musical instruments towers within a popular urban park.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

A Byzantine-era church hidden in a wooded area below the Acropolis.

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

Large collection from the 3rd millennium BCE.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

A sharp sculpture made of thousands of pieces of jagged glass.

Monument to a suicide protesting the Soviet invasion.

This automated sculpture of two men peeing will spell out text messages with their micturition.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.