The Boston home of a conductor on the Underground Railroad.

Former home of an abolitionist couple who escaped slavery and established the most active Underground Railroad stop in Boston.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

A luxury hotel constructed out of a former jail.

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

This hidden labyrinth offers walkers some brief peace of mind.

Whimsical cookie-themed plaques mark the birthplace of the Fig Newton.

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

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

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

This is the house that spite built.

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

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

This small shop walked so America could run on Dunkin'.

One of the indelible moments of the American Revolution took place at this location.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

One of the now-less-hidden floral gems of the "Emerald Necklace."

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

Scene of the grisly murder of two Norwegian women in 1873.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

A quiet spot commemorating two naturalists who had to choose between love and the university at which they both taught.