A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

This modern monument to pagan belief looks like it was transported straight from ancient times.

The most powerful waterfall in all of Europe.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Described as "the world's most blinging pool."

A slice of central Asia in the middle of Berlin.

A massive mausoleum towers over the gravestones in a 19th-century Italian "model village."

Two small chapels housed inside an ancient tree.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

A surreal museum of extraordinary industrial objects.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Remains of an abandoned coral city.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Fish raining from the sky are the cause of a yearly celebration in this small Honduran town.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

This corn maze so big you may want to pack a lunch, and possibly a flaregun.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

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

A whimsical village of unique treehouses resides in a Washington forest.

From 135 feet high riders plunge down the world's tallest freestanding body slide at 65 mph.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

This large midwestern cavern features impressive rock formations and an underground waterfall.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.