A historic town sits upon the site of a long-lost 18th-century trading community.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

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

In which a local geological marvel becomes a quaint roadside attraction.

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

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

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

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

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

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

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

The oldest surviving presidential residence in the United States.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

The humble field where the first Major League Baseball game was played.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

A haunting tribute to pioneering photographer Clover Adams.

The site of the climactic scene from the classic horror film is now a historic landmark.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

The trials and tribulations of marking Poe's grave.

Surrounded by industrial sprawl, a small monument marks the site of William Penn's first landing in Pennsylvania.

The final resting place of one of the United States's greatest poets.

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

A glittering Thai Buddhist temple in suburban Pennsylvania.