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

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Once the home of a hermetic monk, this cave now houses a small church.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This cemetery features modernist statues as strange as its name.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Charles Babbage's proto-computer, painstakingly brought to life.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Ship-sized kinetic sculptural fantasy.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A cruise ship retraces the the route of the doomed RMS Titanic, 100 years later.

Vibrant street art created with mixed media.

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

One of downtown Berlin's last reminders of its Communist past.

The site of Austria's biggest concentration camp now honors its victims.

The prototype for all Nazi concentration camps.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

Monasteries on rock pillars, once accessible only by frayed ropes.

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

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

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