Statue commemorating the use of ether in anesthesia.

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

A men’s restroom became a sandwich shop.

The Boston square dedicated to the dark poet who was born nearby.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Painstakingly built dioramas sit unnoticed in a Boston office building.

A curious blend of taxidermy, antique tools, creationism, and a purported antediluvian rock.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

The Decoy Capital of the World.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

World War II bunker still standing on the New Jersey beach.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Why walk on this historical site when you can zoom down instead?

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

A museum dedicated to exhibiting remarkable outsider art.

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.