Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

A former copper mine which became a truly unsuccessful prison.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

Journey inside the bowels of this sperm whale sculpture.

This tribute to the founding father of the American dictionary originally contained a spelling error.

A parade of antique steeds offers a quirky ride through history.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This pun was simply waiting to come to life, and one defense contractor made it so.

This hidden treasure provides a charming access point along the south side of Baker Park.

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

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

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Once America's tallest structure, now a Baltimore landmark.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The trials and tribulations of marking Poe’s grave.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.