Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Rebuilt remains of a temple to Roman god Mithras.

A clear blue swimming hole with hidden caves, still unexplored.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Experience park where visitors are told to expect the unexpected.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

An acoustic anomaly with a mysterious cause.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Cat art as far as the eye can see.

More gold than anywhere else, ever.

The magical, mossy forest that inspired Princess Mononoke.

Museum preserving torture methods from the past.

The beautiful baroque library of the Hapsburg empire.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The private clubhouse for the members of the Academy of Magical Arts.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A castle that was built stone by stone by an eccentric journalist.

The angel of death appears to weep black tears at this grave marker.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The most visited, and possibly most controversial, museum in Germany.

A modernist landscape of water and sci-fi concrete.