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

Arlington Cemetery exhibit dedicated to death and grieving.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

While seemingly a cruel joke, this bench actually honors an esteemed member of the community who passed away in 2006.

A tragic mystery left this boy nameless for 65 years.

A well-preserved example of an early industrial operation in the northeastern United States.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

One of the world's oldest continually operating bookstores.

This iconic Lancaster everyman has been reading the same story since 1980.

The Ryerss mansion in Burholme Park now houses a community library and a museum filled with a trove of oddities from around the world.

The first marker along the famous boundary.

A piece of baseball history is preserved in a Pittsburgh parking lot.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

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

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

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

This giant disembodied horse head seems to balance impossibly on its nose.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

The oldest surviving presidential residence in the United States.

One of Philadelphia's largest murals resides hidden under this bridge.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This historic old movie house was the scene of one of the Blob's most iconic attacks.