One of the only single-person private gravesites in New York City.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

Where the four original members of the Ramones hung out and revolutionized punk rock.

A Ukrainian church canteen doles out hearty fare in an East Village basement.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Finally, you don't have to be a pious Swedish seaman to relax like one.

Nikola Tesla's former home contains an homage hidden from plain sight.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

A crumbling mountain resort that looks like it was abandoned in an instant.

A tragedy and memorial that raised awareness about the dangers of unsealed mineshafts.

This life-sized effigy commemorates the dedicated abolitionist and social reformer.

Once a home for cows and hay, this barn has been transformed into an event cathedral.

A memorial to the Potawatomi chief who allegedly ran nearly 150 miles to alert settlers of an impending attack.

A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

The last remaining tollhouse in Michigan built during the 19th-century plank road craze.

This scenic overlook commemorates the tragic death of a soon-to-be-married lumberjack.

Taxidermy and miniatures come together to create this unique museum.

This 19th-century former train station’s unusual roof shape earned it a rather witchy name.

The former home is said to be haunted by the ghosts of the beloved mayor and his wife who lived here.

This little barrel-shaped cottage by Lake Superior was once a cartoonist's summer retreat.