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

Only known mainland rookery of the threatened Stellar sea lion.

The longest continuous lava tube in Oregon.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

An exotic wildlife habitat right off The Strip.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Take a monster truck tour around an ostrich farm in the middle of the desert.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

Belly up to the bar in Cowtown, don't forget to buy some boots.

A modernist landscape of water and sci-fi concrete.

The highway's southernmost spot is a beloved local attraction.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

Steepest flood safety railway in the entire world.

Rare recess caves fill this unbelievably beautiful Ohio park.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.