Statue commemorating the use of ether in anesthesia.

Museum dedicated to awful artwork.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

Bouncing, delightful, mechanical art at the MIT Museum.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

This supermarket is suspended 25 feet above an interstate highway.

A historic bridge with a lovely acoustic anomaly.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

A building so large that it has its own weather.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A crumbling hospital from the 1850s on Roosevelt Island.

One of only two commuter aerial tramways in the United States.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

The hallucinogenic center of the ancient world.

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

Where commuters walk through remnants of an ancient Greek necropolis.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A historic Montreal market that was the city's agricultural hub for over century.