This large, castle-like structure is hidden amid the mountains on the grounds of the Utah State Hospital.

Home to the world's largest quilt collection dating from the 1600s through today.

This once rural mansion now sits in the heart of the city.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

Travelers exchange letters with woodland creatures at this mini post office.

Odd stone and concrete monuments in the "Poet of the Sierras" eclectic folly garden.

This overgrown Illinois water park offers a whole new type of adventure.

This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

A place to eat for on-the-run agents and espionage enthusiasts.

Robots, lasers, and whoopee cushions, oh my!

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

A creepy steel gremlin has protected the Bay Bridge since 1989.

Where unreadable addresses are read, 24 hours a day, seven days a week.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

This granite monument at the site of an ill-conceived tourist attraction is built from the same stone as the Mormon Temple.

An enormous image of Utah's salt flats made entirely from tape.

Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.