A broch is a type of fortified drystone building found only in Scotland. Today, you'll head to the northeast of mainland Orkney to see the Broch of Gurness. Dating from 200 BC, the broch was discovered in 1929 and conveys a strong sense of grandeur with its imposing tower, ramparts and Iron Age house ruins. Travel to the center of Orkney for a contrasting visit to the Ring of Brodgar. This is a fine, truly circular, early Bronze Age stone ring and is an icon of Orkney's ancient heritage. This great henge monument is superbly situated on the Ness of Brodgar, on a windswept sloping plane that is surrounded by the agricultural heart of Orkney. Your guide will interpret and discuss with you some of the theories surrounding this mystery -- perhaps the megaliths provided a sacred ceremonial site, a prehistoric meeting place, a method of mapping the heavens, or even a monument to ancestors. The culture that designed and constructed the ring is long forgotten, but its legacy is left to amaze modern generations of visitors.