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

A former utopian healing center created by a huckster and built by derelicts.

360-degree virtual reality chamber physically immerses scientists into their data.

A massive underwater sinkhole made famous by Jacques Cousteau.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A reproduction of earth's many biomes.

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

Massive crater in central Oregon.

A one-of-a-kind collection of a unique medium.

Rippling sand dunes frozen in the Arizona rock.

Ancient man-made caves underneath small town Belgium.

A beautiful but toxic fountain of mercury.

A botanic garden full of trees twisted into fantastic shapes and positions.

This structure among the trees was the result of divine inspiration.

Ride a dragon train into a world of dwarves.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

What once claimed to be the world's tallest single-family wooden structure house.

A river with some unusual, and occasionally dangerous, habits.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Be a ninja - or just act like one.

Every year, over 25,000 monarchs overwinter in Pacific Grove.