Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

This giant disembodied horse head seems to balance impossibly on its nose.

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

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

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

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

Yo, Adrian!

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

Three prestigious academic collections come together to create a world-class natural history museum.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

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

A layered tribute to the work of mosaicist Isaiah Zagar.