The C. A. Nothnagle Log House stands as the oldest surviving log cabin in the United States, offering a remarkable glimpse into America's colonial past.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

An award-winning children’s garden enchants visitors at the intersection of natural beauty and fairy tales.

These small house replicas have stood proudly since the 1950s, even as the property has changed hands.

This historic boathouse was constructed using salvaged lumber from burned barns.

The oldest continuously operating fish market in the United States.

A wondrous old library overlooking the nation's capital.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

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

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Largest Roman Catholic church in North America.

A historic Maryland home that once belonged to a man who has been called "the most insignificant" U.S. Supreme Court justice.

This free, take-a-book shop seems like a trick but isn't.

One of the few remaining Rosenwald Schools left in Virginia.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

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

A lawn full of retired spacecraft on display at one of NASA's first research labs.

This grove was planted more than a century ago by the War Mothers of World War I.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.