As the oldest natural history museum in the Americas, these halls contain everything from dinosaur bones to biological samples collected by Lewis and Clark.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

Dr Barnes' $25 billion private collection of art and arboretum.

This might just be the TARDIS of bookstores.

The world’s first penitentiary, meant to be humane, drove men insane.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

Yo, Adrian!

Where the famed frontiersman was born, raised, and survived Quaker intrigue

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

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

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

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

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A bronze statue to commemorate the former president's visit to a local Polish-American festival.

Pennsylvanian mass grave and possibly mass murder.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A beloved horticultural oasis on the grounds of a wealthy family's former estate.

A museum of anything and everything Stooge.

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

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