Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

Sloth rehabilitation center in the jungle of Costa Rica.

A hidden beach at the end of a tunnel of mangrove trees.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

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

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The sun acts as a key that only fits this giant keyhole twice a year.

A "haunted" landmark on the coast of Southern California.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Unrepaired walls from a 1920 anarchist bomb attack.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

Nature took her revenge on the "Wickedest City in the World."

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.