Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Volcanically heated hot springs.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

A secret climbing tree hides along the side of a Costa Rican road.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

A natural swimming hole that was once a ceremonial center for Mayan priests.

An important Mayan religious and trading center dating back to 200 BC.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

A massive underwater sinkhole made famous by Jacques Cousteau.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

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

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

This 1920s Dutch barge is now a floating bookstore.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

The longest hedge maze in the world.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Famously misunderstood wonder of the ancient world

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

These massive moving sand dunes have swallowed an entire village and are still on the run.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This 600-year-old home seems to defy physics.