Dorset Marble Quarry

You scramble up a sheer marble wall, hang your toes over the cliff's edge, hold your breath, and jump. Or not. At forty-some feet above th eicy waters of a long-abandoned marble quarry-it's probably a good idea to think twice. This popular diving hole has become a local institution, welcoming anyone who wants to jump in, splash around and beat the summer heat.

Bring a towel, your suit, and your nerve.