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

A daily replay of the experiment that proved the rotation of the Earth.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This quirky museum has a collection of more than 15,000 bobblehead dolls.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

This elaborate towering structure was once famed for its revolutionary height.

This secluded walking trail is a hidden gem of a Pittsburgh park.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

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

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This little museum in the town where zombies were born celebrates the living dead.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Constructed from the ruins of a former glass factory, this park incorporates the old with the new.

Faces carved into the cliffs create an otherworldly walking trail.

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

California's first suspension bridge.

History is hiding at the Morean Center for Clay.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

Though an earthquake destroyed this village in 1980, one former resident still walks its streets every day.