A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

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

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

What remains of the summer palace of King Kamehameha III.

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

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

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

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

Hundreds of protractors affixed to surfaces all over the city.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

America's largest man-made forest was planted in an effort to bring back the past.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Less a museum than a bizarre fantasy world created by artists and engineers.