This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A stone marker commemorating the first time sound was transmitted over wires.

Millions of numbers carved in glass represent the tattoos forced upon victims.

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

Dedicated to nine marines from Massachusetts who perished during the Beirut bombings.

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

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.

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

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

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

Painstakingly built dioramas sit unnoticed in a Boston office building.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

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

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

A memorial to Chinese freedom in the city where American freedom was born.

These whimsical works of art tell the story of the city's past and present.