Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The famous facade of Grand Central Terminal hides a regulation tennis court—and it's not the first one.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

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.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Lie in a hammock where George Washington stood.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

New York City's smallest piece of private property.

Try not to get slimed in Tribeca.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

This working class sculpture pounds his hammer all the livelong day.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

This former coal gasification plant found a curious second life as a popular public park.

A giant Troll lurks under one of Seattle's oldest bridges.

A walk through the historic city center, under the streets of Seattle.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Hamburgers are intensely proud of their tunnel beneath the river.

Model Trains and Much More in Hamburg.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Hidden beneath the streets of London is a secret subway that only carried mail.