An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

An office built to look like a giant basket.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

These beautiful wineries were at the center of Lake Erie's "grape belt" back when the Midwest dominated American wine production.

This burger joint is named after everyone's favorite carnival prize and is adorned with a giant one over the door.

The largest ancient burial mound in Ohio.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

A real flying saucer, contracted by the U.S. Air Force.

This magnificent Cincinnati graveyard is also a popular public park.

Deep scars on the earth left by the Ice Age.

Rare recess caves fill this unbelievably beautiful Ohio park.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The largest earthwork effigy in the world.

Take a drunken tour inside the world's largest known geode.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The "lovely red Vega" of the legendary record-settling pilot.

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