One of Europe's largest supercomputers is housed inside of a disused chapel.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

A lush indoor jungle fills this bustling Madrid transportation hub.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

This overlooked museum houses an amazing collection of rare, antique typewriters.

A celebration of solstice followed by a fiery purging of evils.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A historic Christian shrine nestled within a spectacular natural cave.

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

Final resting place for hundreds of prisoners of war.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

A subterranean playground in an abandoned slate mine.

Visitors can swim with vicious predators in Crocosaurus Cove's plastic daredevil enclosure.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

Orr Park's dead trees have been carved into a menagerie of whimsical visages.