An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

The 30,000-volume library is one of the world's most impressive poetry collections.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

Internationally known record store and purveyor of "dusties."

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

"Looks so real, it's scary!"

Home to a giant switchblade and one of the world's largest collections of pocket knives, this museum is a cut above the rest.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

This beautiful architectural gem was the first waste treatment facility in Boston.

A luxury hotel constructed out of a former jail.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

A mysterious stone embedded at the base of a historic Boston building.

No one messes with the Massachusetts sacred cod, not this time...

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.