The fountain marks the area where hundreds of accused witches were burned at the stake.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A self-built castle made by a mysterious man.

Where beautiful signs live on forever.

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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A floating cat sanctuary on an Amsterdam canal.

A trash dump made beautiful by nature's power.

The first declared National Monument in the United States.

This abandoned amusement park was built on a site with a dark history.

Where manatees are the snowbird vacationers in these balmy Florida springs.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

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

Two stunning 17th-century libraries and a cabinet of curiosities.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Mysterious rocks that ring musically when struck.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The sign at the garden gate reads: "These Plants Can Kill."

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

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.