Skeleton Keys to New York's Secrets, Free While Supplies Last

This summer hundreds of New Yorkers will be seen hastily undoing padlocks, ducking through creaky gates, and rifling through strange P.O. boxes. Do not be alarmed!

The city-wide security breach is part of the public art project Key to the City. Anyone can simply retrieve free keys at a kiosk in Times Square (pictured above), and those keys unlock 24 locations across the city's five boroughs, which are listed on the Key to the City website. These locations include secret gardens, hidden rooms...