Microscopic fossils suggest Australia may be the birthplace of sulphur-based life forms.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

This former railway facility is the oldest in Slovenia, and now houses a museum showcasing the history of steam locomotives.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

On an island south of Iceland, a large volcanic rock formation resembles an elephant.

A popular Icelandic children's story comes to life inside this cave.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

The final resting place of one of the first alleged vampires.

Once a bridge over the River Begej, now high and dry.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

This 15th-century Serbian Orthodox monastery also contained a school for illuminating manuscripts.

The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

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

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

Where commuters walk through remnants of an ancient Greek necropolis.

The Slovenian architect designed many landmarks in the capital city, including his own dream house.

17th century palace once a meeting place for politicians.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.