The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

Once a black market electronics marketplace, now an otaku shopper's paradise.

The church's remarkable frescoes incorporate Finnish artist Hugh Simberg's trademark themes of death and the supernatural.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

One of the last remnants of the Bessemer process that revolutionized steel production during the industrial age.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

An Anglo-Saxon cross inscribed with possibly the oldest written work of English literature.

This artificial archipelago was supposed to resemble a map of the world.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

Whitewashed mosque contains the world's largest carpet.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

The world’s largest LED display, built over an F1 race circuit.

This enormous sports car themed amusement park is home to the world’s fastest roller coaster.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A hundred copies of Antony Gormley's naked body stare out across the water.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.