This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The only museum with its curator—and her pets—buried inside.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

The abandoned summer estate of the former Greek Royal Family.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

An alien landscape on the banks of the Aegean Sea.

A harrowing trail up a mile-high mountain.

Tiny castle in the middle of the Rhine made you pay to pass.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

Remnants of a cone-shaped Nazi bomb shelter.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

The old castle kitchen where nucleic acid was first isolated is considered the "cradle of biochemistry."

A striking 12th-century-style castle built on the edge of a cliff.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.