It would take 35 firetrucks to fill this enormous glacial pothole.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Take a step into the workshop where Edison and his employees revolutionized the world.

The train collection of an eccentric New England seafood mogul is now a National Historical Site.

The only surviving fragment of the lost Narragansett Pier Casino.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

A 60-room castle constructed by a horse-racing heir.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

The oldest still-operating tavern in the United States was once owned by a pirate.

Oldest synagogue in the United States.

Mysterious stone tower featured in many alternative histories of the New World.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

Dedicated to the explorer who opened Japan to the West.

Designed to not only to represent the history of the local community but also, the future.

A single light illuminates one man's overshadowed contributions to street lamp history.

An ode to Japanese artist Hokusai, with a bit of a comical twist.

These three lighthouses played a fundamental role in the maritime life of Eastham.

Once a kitschy symbol for a gift shop, this 38-foot seahorse is now a staple roadside attraction.

This museum dedicated to local history is housed in the state's oldest surviving fire station.

The sea urchin sculpture is an unusual commemoration of a New England town's seafaring history.

Built to bless whalers before their voyages, this Massachusetts church now features a ship-shaped pulpit.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

This roadside wonder is as mysterious as it is beloved.