A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Stalactites and stalagmites in a beautifully lit cave.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A fascinating insight into daily life in the Eastern Bloc.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

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

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This cemetery features modernist statues as strange as its name.

Historic funicular railway, believed to be the shortest railroad in the world.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A hands-off space for graffiti artists to hone and display their skills.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A little slice of Japan and its aesthetics in London's Holland Park.

Catacombs turned marketplace.

This semi-secret storybook hedge maze is also the oldest garden in the city.

One part local history, 99 parts gruesome haunted house.