The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

Race through the maze, get your name on the sign.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

An ode to one of the first concerts broadcast via satellite.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This is one really big nut.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A museum dedicated to the alleged Roswell Incident.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

A miniature train theme park, free to the public, laying at the base of the Santa Monica Mountains.

An extraordinary final resting place full of oversized art, amazing statues, and dead celebrities.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

One of the highest points in Bexar county offers birdseye views of San Antonio and a four-story stone tower.