Frog Pond Skating Rink, Boston

Frog Pond Skating Rink is a concrete formation and a water pool in summer, but in winter it turns into a 16,000-feet outdoor skating rink. On crisp Boston nights, there may be nothing better than a twirl on the ice beneath the trees of the Boston Common and the lights of downtown skyscrapers. You may even have an audience—crowds often gathered on the rail around the pond to watch the skaters glide.