The 19th-century ruins hide deep in an overgrown forest.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

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

One of the oldest surviving Swedish-American homes in the United States.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

An award-winning children’s garden enchants visitors at the intersection of natural beauty and fairy tales.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

The smallest and oldest covered bridge in Delaware.

This heritage rail line meanders through Delaware’s Red Clay Valley.

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

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

Designed to commemorate the founding of the first settlement in Delaware.

A wrecked ship dating back to the American Revolution was only recently discovered off the Delaware coast.

The historic home still shows the scars from a little run-in with the British in 1813.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

A freighter full of exotic animals ends a harrowing voyage impaled on uncharted rocks in the Boston Harbor.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

The oldest automobile museum in the United States.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

This museum is dedicated to the first coast-to-coast highway.