And all that open space, interspersed with bulky and busy playground equipment, provides the ideal opportunity for children ...

Pull out a jigsaw puzzle. It works for Mari Black. A self-described thrill junkie, Black says she gets the rush she craves ...

1. Gobekli Tepe, Turkey (9600-8200 BCE): Considered the oldest structure in the world made by humans, this neolithic settlement features large, standing stones in circles ...

As the clocks go forward this spring, see if you can solve these puzzles based on ancient calendars ... In the ancient world, there were far more radical changes to the way people observed ...