Few people know that the US Marine Corps began at a Philadelphia bar named the Tun Tavern and that a former Quaker was its first commandant.

The Slinky debuted in 1945 at Gimbal's department store in Philadelphia and was an instant hit.

The first performance, which took place on April 3, 1793, included feats of horsemanship, rope dancing, some tumbling and various displays of acrobatics.

Congress Hall was the site of many important historic events from 1790 to 1800. That's when Philadelphia was the temporary capital of the United States.

Philadelphia's clock on top of City Hall is actually 3 ft larger in diameter than Big Ben in London. In fact, our clock was once called Big Penn.

Take a walk or ride near Columbus Boulevard and Christian Street, and you'll see the oldest church in Pennsylvania.

Did you know that the very first balloon flight in America took place right here in Philadelphia?

Stroll behind Independence Hall, and chances are you'll see people photographing a large statue of John Barry, often called the father of the American Navy.

Take a walk along Penn's Landing, and you're sure to run into a four-masted sailing ship that's docked there. That would be the Moshulu.

Busybodies are 3 mirror devices placed above your doorway. They let you see from the second story who's at your door. You can also see who's going in and out of your neighbor's doors.

One of the most magnificent buildings from the Centennial Exhibition of 1876 and one of the few still standing is the Ohio House in West Fairmount Park.

Dream Garden was designated as the city's first ever historic object by the Philadelphia Historical Commission.

While living in Philadelphia from 1838 to 1844, Poe published some of his most well known works.