These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

A medieval setting reimagined into a unique art alley.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

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

Catacombs turned marketplace.

A diminutive statue that was inspired by the sculptor's own daughter.

These waste baskets play a few risque messages to discourage littering.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

At night, this glittering musical tunnel draws skaters and photographers.

A somewhat mysterious biomedical museum housed inside a Spanish university.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Site of the first radio and telephone broadcasting companies in Copenhagen.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.