Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Fonts are born and bred here at the oldest letterpress type foundry in the United States.

The walls of the iconic dome are hollow and have a secret stairway.

360° views of the city plus five floors of optical illusions and hands-on science.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

This former lieutenant governor's home is brimming with curiosities.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A new kind of theme park for adults off the Las Vegas Strip.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A famous hotel houses an impression collection of mini dioramas and giant doll houses.

An old abandoned pharmacy building in Texas is brimming with collectibles and images of the little tuxedoed pooch.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Seasonal, Pacific Northwest cuisine served in a 101 year old firehouse.

A colorful architectural gem in Seattle's uniquely modern Central Library.

A brewery warehouse which doubles as a circus bigtop.