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

Shelves covered in dozens of coffee bean varieties fill this North End institution.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

The massive machine creates cracking displays of indoor lightning.

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.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

A mysterious stone embedded at the base of a historic Boston building.

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

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

The Boston home of a conductor on the Underground Railroad.

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

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

This spooky road cut through a mound of ancient coral might be haunted by a witch.

Narrowest house in Boston.

An enormous, inside-out glass globe built in 1935.

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

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

Dim sum, served in a grand old theater.

Painstakingly built dioramas sit unnoticed in a Boston office building.

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

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

A unique music museum housed in a historic Boston theater.