It's safe—and permitted—to walk across these twin natural sandstone arches.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Somewhat controversial when first unveiled, this gathering of sea creatures has become a hidden gem.

This breathtaking island on Rwanda’s Lake Kivu is a haven for thousands of fruit bats.

This unusual three-way wooden foot bridge spans two rivers at once.

The front of this 17th-century cottage also contains a large, stone face.

An unassuming secret door once led to a legendary watering hole.

A trail of footprints discovered after a landslide was left not by the Devil, as originally believed, but by an early human ancestor.

This medieval settlement was abandoned after a series of landslides. What remained was largely destroyed during a mock battle for a WWII film reel.

The hermit's humble home is hidden near the forested peak of Monte Marrone.

Hidden in a high mountain cave, this hermitage dates back to the ninth century.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

A thousand year old oak tree survives in Liverpool.

The quiet field that inspired one of the most famous songs of all time.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

This single-track road rewards brave drivers with stunning Scottish scenery.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The last manually operated turntable ferry in the world.

The sign announces the Scottish village's cosmic connections, as it's twinned with Glenelg, Mars.

This tiny getaway tucked away in an uninhabited Scottish valley isn't your ordinary teahouse.

Giant sand sculptures of famous people and places are on display near the Tottori sand dunes.

An enigmatic modern marker left next to a historic Roman site.

An architect transformed this abandoned cement factory into his castle-like workshop.