An institution that preserves the history of institutionalization.

The fifth-longest natural arch in the world, and the longest outside China.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

The drama of nature in full effect in this Nevada State Park.

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

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

Come for the speed, leave in love with the desert.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The unbelievably opulent home built for an infamous newspaperman.

In which a local geological marvel becomes a quaint roadside attraction.

The longest continuous lava tube in Oregon.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This unique shop is full of memento mori art, antique medical equipment, secret society paraphernalia, and historical relics.

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

Instead of fruit, the branches of this tree are brimming with hopes and dreams.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

Only known mainland rookery of the threatened Stellar sea lion.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Legends surround this jagged rock formation in the New Mexico desert.

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