America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

The massive machine creates cracking displays of indoor lightning.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

This doorless 20th-century elevator doesn't stop or slow down.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

The third version of this tall sailing ship sits, rusted and burnt, in Lake Ontario.

What was once the largest NFL stadium.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

Be(w)ar(e) the moat around this historic Czech castle.

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

A men’s restroom became a sandwich shop.

A sweet symbol marks the place where torturous executions were once carried out.

The hill that gave the Massachusett tribe, and later the state, its name.

This historic graveyard monument is dedicated to a tragic victim of witch trial hysteria.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

This is the house that spite built.