Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Go take a picture with the inventor of the daguerreotype photographic process.

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

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Decades before the scandal, this staircase on the river was a literal "water gate."

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The 28,000-year-old specimen is remarkably intact.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

These century-old townhouses contain some of the first car garages built in the United States.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Now the site of a high school, this was almost the location of the largest cathedral in the US.

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

Detailed facade of a brownstone in Boerum Hill.