This whimsical stacked cabin looks like something out of a children's book.

The king of U.S. high points towers over every other peak on the continent.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

One person's lost luggage is another person's treasure.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

A giant Troll lurks under one of Seattle's oldest bridges.

Once the most densely populated place in the world, this island is now a ghost town.

An exquisite tunnel of cascading flowers.

Historical Japanese-Dutch relations are honored with haunted rides and flower fields in this replica town.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A 140-year-old castle with underground caves hidden in San Francisco.

A psychedelic labyrinth on the San Francisco bay.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

One of the largest, oldest, darkest, quietest motel rooms in the world.

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.