Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

This former luxury resort in Kaua'i is now an abandoned relic.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

A massive sea stack famous for its appearance in The Goonies.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This charmingly homemade amusement park has been growing for 40 years.

An institution that preserves the history of institutionalization.

Home of Howard Hughes' Spruce Goose.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

See just what life was like in a 19th-century prospecting town.

A cemetery housing wild west legends in South Dakota.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

These massive mitts are made of 30 tons of devotional bronze.

Despite his legacy of work in Spain, Cuba, and Florida, the larger-than-life writer's grave is a simple affair tucked in an Idaho cemetery.

Supposedly Satanic numbers adorn this preserved submarine sail.

Home to the deepest rift anywhere on Earth.