Dedicated to one of the darkest moments in Irish history.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

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

A tiny monument to the classic American candy.

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

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

A giant sculpture head with an optical illusion dedicated to the longtime conductor of the Boston Pops.

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

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

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.

This statue intended for children to enjoy became a minor political spat.

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

Dedicated to a colonial woman who was hanged for being a Quaker.

No one messes with the Massachusetts sacred cod, not this time...

This mosaic commemorates the oldest subway tunnel and station in the United States.

One of the last remaining movie theatres in the country that features a rear-projection system.

Memorial to a beloved puppeteer as well as all street performers.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This historic sculpture from the 16th century is even older than the city of Boston.