Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

This turn of the century masterpiece has a mysterious goaty interloper.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

A huge musical instrument played by the ocean.

Dim sum, served in a grand old theater.

Narrowest house in Boston.

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

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This massive World War II calculator hearkens back to the days when "computer" was a job title.