If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

What is the Thing?

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

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

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Home to the "Circus" trees created by Axel Erlandson.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

One part local history, 99 parts gruesome haunted house.

The magic's in the hole!

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

The world's longest known cave system.

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.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

The first declared National Monument in the United States.

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

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