A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

The longest covered bridge in Delaware.

An unusual and eclectic collection of local historical memorabilia.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

This might just be the TARDIS of bookstores.

The longest-covered bridge in the state of Maryland.

A rural colonial settlement that contains the remains of a store and cooper.

This school was designed to support the rebuilding of African American schools around Delaware.

The tombstone of the founder of the lost town of Ogletown is now stuck inside a traffic median.

Hundreds of antiquated typewriters and office machinery show the technological evolution of business.

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

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

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

One of the oldest of its kind.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

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

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

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

The abandoned coal loading dock is a canvas for unsanctioned art.

A rare view of a preserved Victorian science museum.

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