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

This imperial marble stele was given to Harvard by Chinese alumni in the 1930s.

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

Narrowest house in Boston.

This landmark cemetery in Boston was created more than 300 years ago.

Historic Hull Street was actually the first street with a proper name in the Boston area.

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

Vibrant street art created with mixed media.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The surviving remnants of a destroyed medieval church now stand in a public park.

Two large posteriors in one giant statue.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

On the Hudson resides one of the largest clocks in the world.

The home of the first American-born saint is one of the only curved buildings in New York.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Unrepaired walls from a 1920 anarchist bomb attack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Wooden pavers represent a 17th-century barrier that gave Wall Street its name.

Peek through the gates at this oasis from the city, full of Old English charm.

A playground the size of a city block is a modernist monument to civic values and public housing.

An aptly-named street near the birthplace of the modern LGBT rights movement.