One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The world's largest model of our planetary system.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

Largest lake in Great Britain measured by surface area.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The celebrated eyesore created by starry-eyed sweethearts.

This bridge was constructed from the rubble of the infamous Bastille.

The encased skull that is widely believed to belong to St. John the Baptist.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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

What once sat in the world’s spotlight is today a largely disused ghost complex.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

A perfect turquoise lake colored with glacier dust.

The glacier tucked within a New Zealand rainforest.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This sheep farm has been forever transformed since being built for “The Hobbit” film series.

Tubing through a cave lit with glowworms is a magical underground experience.

This strange geological landscape erupts with sudden bursts of water.