Nature's biggest mammal swims in landlocked Oklahoma.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

An acoustic anomaly with a mysterious cause.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

When ecosystems collide in the arid Southwest.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

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

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

A small Wyoming town is home to the state's oldest-operating soda fountain.

At the time of its completion, it was the tallest dam in the world.

Dance on a hand-hewn log floor padded with bouncy boxcar springs at a saloon built in 1883.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.