The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

Bouncing, delightful, mechanical art at the MIT Museum.

The drawbridge used in the filming of the movie 'Annie' has been in the open position as it was in the movie for decades.

Dedicated to one of the most successful boxers to compete in the heavyweight division.

One of the world's oldest continually operating bookstores.

In use from 1742 to 1910, only flat headstones were allowed in this cemetery.

It's said that this stone with its mysterious runic inscription is evidence of the Norse visiting Narragansett.

The helicopter that "Tricky Dick" absconded from the White House in on his last day in office.

This family of wooden moose statues have become local celebrities in their hometown.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

The location where the American Revolution ended.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

One of the camera company's former manufacturing buildings is now a museum dedicated to its history.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

A smaller model of the Da Vinci sculpture that took 500 years to come to life.

The headquarters of the semiconductor giant has a 10,000-square-foot museum.

Art Deco stylings conceal the true nature of this bridge.

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

Worker-owned cooperative and resource for those looking to lighten their ecological footprint.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

A former plant in one of the hubs of U.S. steelmaking has been turned into this museum celebrating the history of American industry.

Home of the only civilian casualty at the Battle of Gettysburg.