A theme park attraction designed to turn your children into LARPers.

The center of the only hemisphere that awards visitors with a commemorative coin.

Wisconsin's most celebrated export gets the royal treatment on I-94.

This striking art museum holds an amazing series of curiosity cabinets.

The arboretum whose marshy soil sucked up the dreams of housing developers.

This pebble beach is so beautiful that taking its rocks is against the law.

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

A giant time capsule not scheduled to be cored until 2040.

Home of a 28-foot tall stalagmite known as the War Club.

The highest point in Maryland is only accessible by hiking through another state.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

A computer bug so primitive it was an actual insect.

The national park was once a plantation estate.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.