A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Italian cave with exceptional acoustics and an unsavory history.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

The taxidermy remains of the most popular pony in children's literature.

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

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

Impossibly life-like natural history models created out of glass by a father and son.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

Three prestigious academic collections come together to create a world-class natural history museum.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

In the 19th century, this was the center of Boston's Black community.

This historic patch of real estate offers a glimpse of colonial Boston.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

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

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

An aptly-named street near the birthplace of the modern LGBT rights movement.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.