In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

A wrecked ship dating back to the American Revolution was only recently discovered off the Delaware coast.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

Within this beautiful Pittsburgh cemetery, a unique headstone bears witness to one man's eternal love for Jaws.

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

A larger-than-life statue of America's favorite sundae marks the place it was invented.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A rare view of a preserved Victorian science museum.

Mysterious rocks that ring musically when struck.

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

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.