This fantastical waterfall is hidden in a cave located in a cracked cliff.

A rare view of a preserved Victorian science museum.

One person's lost luggage is another person's treasure.

A winding path built in secret on the edge of the continent.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A gargantuan crystal kingdom.

An ethereal glowing blue ocean cave in Croatia.

Every autumn, this hillside is ablaze with red summer cypress.

A natural gas leak provides a flickering flame beneath a waterfall.

This shop for all your super spy needs hides an educational secret.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

Shop selling 500 flavors of soda has something for everyone.

World War II-era Nazi compound nestled in the Santa Monica hills.

A beautiful geyser under environmental threat.

Once the most densely populated place in the world, this island is now a ghost town.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A 30-acre garden inspired by the principles of modern physics.

An Aztec snake god has taken the material form of an apartment complex.

Pompeii's less famous neighbor is still revealing her secrets.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."