Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

This is what trains will look like after the zombie apocalypse.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An abandoned faux-pub made famous by a Guinness commercial.

The steepest classic funicular in the world glides along a dizzying incline.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

Ruins of a German Castle on top of a towering stone pillar.

The shell of a medieval fortress offers commanding views of the area it once protected.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Ancient man-made caves underneath small town Belgium.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

This abandoned Belgian fortress is purposefully being left to nature.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

This historical Netherlands fortress still bears the marks of its single siege.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This collection of solar timekeepers includes the world's first digital sundial.