In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Where Venice's gondolas go for a tune-up.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

Little Red Lighthouse under the George Washington Bridge.

Rummage through this sunken ship, but leave your scuba gear at home.

An artist's cute bronze subway sculptures belie his violent artistic past.

Avoid gangster interaction while window-shopping.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

A very classy 1920s-era bar right in Grand Central Station.

Slyly buy a shake in the Parker Meridien lobby.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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

Elevated freight railway turned wildly successful urban park.

A Nesting Doll of Churches.

Water and windows define this defensive Italian well.

The middle finger of modernity.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Five candy-colored villages on the Italian Riviera.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Go inside to really appreciate this 500-year-old technological masterpiece.

Venice's island of the dead.

100 year tradition of fist fights, marked by marble footsteps.