This Connecticut ferry has been operating in some form since 1655.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

The largest island on the great salt lake is home to curious creatures and strange stories.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A gothic-styled structure that has been the location for several movies.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

The final resting place of an iconic drag performer is decorated with pearls and hot-pink lipstick.

A Civil War Museum with some notable medical antiques.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

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

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

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

A museum dedicated to exhibiting remarkable outsider art.

The trials and tribulations of marking Poe's grave.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

This giant disembodied horse head seems to balance impossibly on its nose.

A daily replay of the experiment that proved the rotation of the Earth.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.