Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Home to items never before seen by the public.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The site of the climactic scene from the classic horror film is now a historic landmark.

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

A beautiful geyser under environmental threat.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A giant Troll lurks under one of Seattle's oldest bridges.

A battle between nature and architecture in the Cambodian jungle.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Northern Ireland's Brobdingnagian stepping stones.

Famously misunderstood wonder of the ancient world

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Macabre astrological automaton clock dating to the late 1400s.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Dramatic river bend surrounds a natural red-rocked pedestal.

The fairy tale castle of the "fairy-tale king."

Medicinal spa created with the discharge from a geothermal energy plant.

Most-visited and most-photographed slot canyon in the American Southwest.

A church of bones, decorated with 40,000 human skeletons.