The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Perhaps the most scandalous statue of America's first president.

This taxidermy horse was a Civil War hero.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

A wondrous old library overlooking the nation's capital.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

There’s a special club house at the top for the bell ringers.

Home to a vast and influential collection of Shakespeareana.

A nostalgic bibliographic gem.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

Largest Roman Catholic church in North America.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

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