This historic Boston building has gone from personal estate to porn theater and back again.

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

A steampunk wonderland that preserves America's history of industrial innovation.

A unique music museum housed in a historic Boston theater.

A gift to the children of Boston, this bronze bear represents playfulness, a spirit of love, and the warmth of big hugs.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Located in a beautifully restored ice house, this museum is the result of decades of hard work and devotion to the craft of plumbing.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

Painstakingly built dioramas sit unnoticed in a Boston office building.

This picturesque Victorian ghost town was once a thriving mill community.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

Large Massachusetts museum dedicated to Armenian history and culture.

The macabre paintings created by famous suicide proponent Jack Kevorkian, or "Dr. Death."

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

Solar powered Spectacle Island features all-green facilities.

This castle constructed in 1928 was crafted from drawings of Lismore Castle in Ireland.

Hill-like structures formed by glaciers and sandy spits of land.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.