In the summer, the area around this sculpture transforms into a vibrant concert venue.

This camera store in Milan holds one of Europe’s largest collections of luxury-antique cameras.

Scars of this building's past life as a violent prison still cover its walls.

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

This ancient hydrological marvel is now the base of a modern outdoor cinema.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

A once-secret library of Freemason history in Catalonia.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

To the great disappointment of doomsdayers, this codex merely contains records of the Moon and Venus.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

Flowers have mysteriously appeared on her effigy every day for the last 150 years.

This lurid German fountain plots the sad course of marriage from dating to death.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.