Couple's personal collection of pinball machines turned public pinball museum.

A house filled to the brim with oddities and curiosities.

A walk through the historic city center, under the streets of Seattle.

Rustic natural hot springs in the deciduous rain forest.

Science fiction's grandfather has a fittingly marvelous tomb.

A black cottonwood gets a second life as a home for books.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The largest self-built castle in the U.S., six decades in the making.

Deadly airliner crash preserved for those willing to climb and pay respects.

"I did this all while you were watching TV."

A museum of unusual collections, mini-towns, and a half-dog, half-alligator.

Two dozen pinball games hidden away inside a most unlikely location.

This childhood throwback has hundreds of arcade games and pinball machines to transport you back in time.

A vintage penny arcade hidden in the back of a fun fair-themed bar.

Where hikers on the Tecumseh Trail can exchange a dirty sock for a free geode.

Tucked away in the forests of Indiana resides an abandoned waterslide that is now a popular graffiti haunt.

World's only nuclear reactor operated by liberal arts undergraduates.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A massive collection of rare and antique books in a tiny ranching community in northern Texas.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

Home to a giant switchblade and one of the world's largest collections of pocket knives, this museum is a cut above the rest.

A shady solar power system that couldn't hold up to the harsh desert conditions.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

Two World War II aircraft lie within the jungle around this abandoned runway.