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

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

These lush botanical gardens employ the most purrfect pest control force.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A glittering Thai Buddhist temple in suburban Pennsylvania.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

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

An outlandish shoe shaped house built by an eccentric millionaire.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

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

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

A whopping 14,000 copper coins cover this miniature fighter jet.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

One street divides a single town that stands in two U.S. states.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Outsider art meets paleontology at this roadside reptile repository.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

First a root beer ad, then a golf course clubhouse, and finally a massive teapot.