The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

People leave coins atop an unusual grave marker in one of Scotland's oldest burial grounds.

A pair of mosaics marks the spot where the last accused witch of Dundee was put to death.

A bronze tribute to the wildly popular video game from the '90s.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This Communist-era residential block is one of the longest residential building in Europe.

This antique thermometer honors the creator of the first universal temperature scale.

An enormous and lavish Gothic church in Czechia.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

A church of bones, decorated with 40,000 human skeletons.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This museum is rotten with a century of wax medical deformities.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The largest and most famous wax anatomical collection anywhere in the world.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

This zoological museum began as the first great curiosity cabinet.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

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