Hut with supplies for shipwreck survivors.

The site of the first "historically true" UFO encounter in the U.S.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

She become one of the first women to serve in the United States military by secretly dressing like a man.

A unique sculpture park that specializes in the huge and bizarre.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

An Irish Memorial commemorating those who perished due to potato blight.

This beloved marketplace mascot poops money and grants good luck.

Alexander Hamilton’s creation caused quite a bit of controversy.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

World's first "penitentiary," meant to be humane, drove men insane.

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

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.