The museum chronicling a treasure hunter's dream, fulfilled.

A monument celebrating the idea of reaching inaccessible places.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

The land is home to swimming ponies and a legendary 18th-century treasure.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

A castle built for love, and abandoned due to heartbreak.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Bizarre Cavern.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Home to items never before seen by the public.

America's first federal monument.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

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

The first American department store, and home to the largest operating musical instrument in the world.

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

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

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

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.