A lonely Gondola stuck on a traffic circle sits in a spot where it once would have floated down the Grand Canal.

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

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Oldest building in California still in use.

Friction between grains of sand cause a curious "singing" sound.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Former villa and estate of James Deering developed to preserve native tropical forests.

Large collection from the 3rd millennium BCE.

A 60-room castle constructed by a horse-racing heir.

Bouncing, delightful, mechanical art at the MIT Museum.

Only hotel where you can legally launder money.

Eco-friendly island mansion.

Longest fortress system anywhere in Europe.

From pre-war whiskey cocktails to prohibition-era speakeasy secrecy, this bar has seen it all.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

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

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

This parking garage was the site of what was - at the time - the largest cash robbery in history.

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

A beautiful Victorian-era cemetery, complete with a miniature village.

Mysterious 500-year-old tapestries depict a unicorn hunt.