Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Nightmarish example of the unintended consequences of weapons testing.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

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

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A spectacular cave and a beguiling lake.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Dedicated to an "Unknown Man," this grave holds either the remains of a lovelorn suicide or a Cold War spy.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This museum promotes informed contraception by documenting its often secret past.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

The world's largest maze is a nature park with nearly 200 decision points.

The topiary maze at the Habsburg hunting lodge.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

The longest navigable underground river in the United States is home to countless blind and albino animals.

One of the largest caverns in the world has a maw large enough to stack cathedrals in.

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

The world's brightest bioluminescent bay.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The central mosque of this Mali town is entirely built from mud.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

The right to a full beard is honored by the grave of a man who was attacked and jailed due to his facial hair.