A tiny piece of the Moon is embedded in this stained glass masterpiece.

Home to items never before seen by the public.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A historic neighborhood church is reborn as a psychedelic arts collective.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The oldest continuously operating fish market in the United States.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Where the lovelorn find a home for their sentimental keepsakes.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

A historic cemetery filled with quirky faux wood art and unique tombstones.