The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

At 207 feet, one of the world's longest continuous escalators.

The resting place of a Civil War celebrity's amputated limb.

The narrowest house in America is seven feet of pure spite.

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

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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.

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

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

Remnants of a storybook amusement park hidden behind a strip mall.

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.

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

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 statue honors the author's groundbreaking family story.

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

The smallest covered bridge in Maryland.

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