The former sign of this immortal music venue is just that--undying.

A terrific purveyor of natural history objects and curios.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

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

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

At 207 feet, one of the world's longest continuous escalators.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Washington's iconic carousel has a nice piece of Civil Rights history.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An overlooked memorial honoring the local Washington residents who died in World War I.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

250-year-old farm now features sculptures, a petting zoo and a hippy-bazaar.

The only surviving fragment of the lost Narragansett Pier Casino.

Unicorns, elephants, and bears, oh my!

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

The only structure left with direct ties to the Salem witchcraft trials of 1692.