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

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

This outdoor gallery of sculptures along the East River was once a landfill.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

The highest rapid transit station in the world.

One of only two remaining Victorian-era greenhouses in New York.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

A scale model of Russia so big visitors are offered binoculars to rent so they can see the whole thing.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This forgotten boat elevator was an engineering marvel in its heyday.

These abandoned waterworks are crumbling into the Potomac River.

The span is crooked and made from two older recycled bridges.

Every drop of D.C. tap water flows through this old waterworks.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

FDR's Art Deco hospital tower was hopelessly inefficient.