England is dotted with famous monuments and historic sites, from ancient burial grounds and abandoned mines to standing stones, stone circles and icons from far more recent times. People from around the world have been drawn to mysterious Stonehenge for more than 50,000 years and this national treasure continues to intrigue more than 1 million visitors each year. Who or what put those giant stones into place? Is the site an ancient calendar, a burial ground or a place of worship? More recently, the Iron Bridge is symbolic of the achievements of the Industrial Revolution.