Eight feet in diameter and more than 24 feet around.

This remote island in Iowa was abandoned after being devastated by flood.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

These buildings are a poignant reminder of the thousands of horses and mules who passed through this area of the Shenandoah Valley on their way to war.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

This three-story Victorian mansion is now home to the National Park Service’s Historic Preservation Training Center headquarters.

Unannounced visitors are now welcome at the site of the largest Prohibition-era bootlegging operation in the region.

The smallest covered bridge in Maryland.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

A well-preserved quarry and six of eight continuous burning pot kilns used to make burnt lime and crushed stone are highlights of the self-guided walking tour in Fountain Rock Park.

Take a trip to the past aboard a 1920s railcar or open flatcar for a scenic ride through Maryland farm country.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

One of the only memorials dedicated to journalists who died in combat.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The "Sultan of Swat" once attended a school at the site of this baseball field.

A former pillar of the Black community in Ellicott City.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.