Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow, expelled by a volcano during an eruption. They can be actively draining lava from a source, or can be extinct, meaning the lava flow has ceased and the rock has cooled and left a long, cave-like channel.
The Twins Day Festival in Twinsburg, Ohio, first took place in 1976, and it has grown and become more and more famous ever since. The attendees every year run the range of ages from newborns to octogenarians. The festival includes a golf tournament, children's field games, raffle, entertainment, dancing, twin contests and a parade from the town square to the festival site.