Plagued with warts? Leave a frog at this small shrine in the city of Tosa, and you may be cured.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Located in the remote Monitor Valley, this travertine bowl contains a scalding pool of water.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

The widest natural waterfall in Estonia is a sight to see in all seasons.

For this chef, an active volcano is his oven.

A Buddhist temple covered in intricate designs and carvings made out of seashells and pieces of coral.

Singapore's Ang Mo Kio Town Garden West is a social hotspot for songbirds and their humans.

A train ride to the middle of nowhere gives its passengers some of the most iconic views of Japan's seasons.

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

This crumbling coast and its teetering tower are literally filled with history, but they are also at great risk of becoming history themselves.

This gravelly, dangerous highway is the only road in the United States that leads to the Arctic Ocean.

This astronomically-aligned stone circle was the first of its kind to be built in Great Britain after a 3,000-year hiatus.

This fine-dining restaurant features native New Zealand ingredients and Māori cooking.

The hike to this stunning waterfall on a black sand beach is not for the faint of heart.

A quaint village where bomb casings from the Second Indochina War have been repurposed into mundane objects.

The last water-powered mill in Oregon is open daily for free tours and has a surprising history.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Take a dip beneath the stalactites in this amazing cenote.

This popular cave pool is truly magical, despite the crowds.

A sprawling network of century-old subterranean catacombs lies beneath a nondescript suburban home.