A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

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

New York City's smallest piece of private property.

The first piece of public art dedicated to LGBT rights.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

What is it about mushrooms that makes people wish they lived inside of them?

The largest earthwork effigy in the world.

One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

The oldest brick house in the state of Ohio.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

A circle of giant painted vases in the former pottery capital of the United States.

One of the last few period-correct, hand-operated canal locks in the country.

This stately clubhouse has showcased German-American culture for over a century.

The oldest experimental corn field in America is still creating better ways to grow crops.

This historic lavatory leftover features two levels of defecation stations completely without context.

This folk art wall claims to be the world's one and only memorial to the bygone age of hippies.

The multinational Burger King chain is banned from operating within 20 miles of a family restaurant filed under the same name.

This small-town park in southern Illinois has a 1,000,000-gallon swimming pool and a 100,000-barrel oil well.

The 40-year-old machine serves soda quicker than you can catch it for a mere 75 cents a pop.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.