The glowing blue Nymphaeum of Emperor Tiberius.

A historical puzzle lies at the origins of this structure.

The hallucinogenic center of the ancient world.

Built by the Ancient Greeks, this chariot bridge is still in use today.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

One of the world's oldest olive trees, thought to be over 2,000 years old.

Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

A musical instrument played by the sea.

This fountain has a growing (animal) population, and might also be growing in size.

An ethereal glowing blue ocean cave in Croatia.

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

Some of the secrets of human origin are revealed at this museum.

A former salt mine is now a cool picnic spot for families and asthmatics.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

For nearly 2,000 years this church has been waging war on local snakes by importing cats.

More than 20,000 salt and pepper shakers from across the globe call this museum home.

The water here is so clear you can see the mysteriously sunken ship from the surface.

Housed in a stunning Victorian building, this museum has the largest exhibition of knives, blades, penknives, and scissors in Spain.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The ancient tomb acts as a calendar that keeps perfect time.

An ancient neolithic tomb that only sees the sun twice a year.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A 150-year-old steam locomotive crosses the southern half of the island daily.