These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

London's smallest police station is barely the size of a phone booth.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

An informal walk of fame in front of a Hollywood office building remembers a comedic great and his associates.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

A gas station has taken the place of the home of the 19th American President.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

The playful side of the Columbus community is on full display.

Three bronze deer sculptures relax along the Scioto Mile.

Just outside the Ohio Supreme Court sits a testament to justice.

A bronze of the man in all his sinewy glory celebrates his longtime connection to the Ohio city.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

This giant disembodied horse head seems to balance impossibly on its nose.

The oldest surviving presidential residence in the United States.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

An Irish Memorial commemorating those who perished due to potato blight.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

One of Philadelphia's largest murals resides hidden under this bridge.