Tiny observatory made big contributions to the study of the Earth's motion.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

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

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

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

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

Walk through the history of American pop culture.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

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

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

Wine bottle sculpture with a ship's stateroom inside.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

Slyly buy a shake in the Parker Meridien lobby.

Read a book next to a Midtown waterfall.

A Manhattan office building is home to the world's largest chess board.

A staggering collection of photographs depicting medical, social, and historical change.

This semi-hidden Manhattan restaurant is based out of a loading dock.