This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

The majority of the highest mountain in Poland is actually located in a different country.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

Canada’s surprisingly controversial monument to Dwight Eisenhower.

These delicate sand pyramids look like naturally occurring gothic spires.

This man-made waterfall was designed to help improve access for spawning salmon.

This revered mutant tree was felled in an act of ecoterrorism leaving a legacy of myth and possibly murder.

A remote gravestone on the moor marks the spot where a teacher's body was found under mysterious circumstances that remain inexplicable.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Commonly acknowledged as the only public monument to the Devil himself.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This replica Viking village was created for a film that was never shot and is now open to visitors.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

The English bed-and-breakfast believed to have inspired Emily Brontë's novel "Wuthering Heights."

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

A trash dump made beautiful by nature's power.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

The magical, mossy forest that inspired Princess Mononoke.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .