Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

This temple was constructed entirely by Roman soldiers.

Also known as “Robin Hood’s tree,” it became a famed location along Hadrian's Wall before it was cut down.

This monument pays tribute to the city’s contribution to basketball history.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

There are owls with glowing eyes in Herald Square.

A whimsical, but often overlooked clock in Park Avenue.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

The former hotel where Tesla invented the radio.

A vibrant, 100-foot-tall mural dedicated to Evelyn Nesbit, the tragic icon of the Gilded Age.

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.

The oldest living tree in Manhattan comes shrouded in sinister legend.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

A whimsical monument deep in this park commemorates the groups that helped build it.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

The 570-ton boulder that gave a New Jersey town its name.

This crumbling little graveyard was saved from the undergrowth by concerned veterans.

After the oysters have been shucked, and the restaurant's been shuttered, the terrazzo sidewalk from the 1940s is all that remains.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

The second oldest continuously operating bar in Louisiana.