One of the few remaining covered bridges in Lancaster County.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

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

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

The smallest and oldest covered bridge in Delaware.

The second oldest and longest of Delaware's three covered bridges.

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

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The taxidermy remains of the most popular pony in children's literature.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

One of the oldest of its kind.

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

A completely round house designed for the Atomic Age.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

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

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

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

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

In Wilmington's hip Trolley Square neighborhood, a utility box has been repainted to resemble a classic gumball machine.