Goseck circle

The Goseck circle is a Neolithic structure in Goseck in the Burgenlandkreis district in Saxony-Anhalt, Germany. It consists of a set of concentric ditches 75 meters (246 feet) across and two palisade rings containing gates in defined places. It is considered the earliest sun observatory currently known in the world. Interpretations of the ring suggest that European Neolithic and Bronze Age people measured the heavens far earlier and more accurately than historians have thought. The site was made public in August 2003. German media have called the site "German Stonehenge," although the use of the term henge for structures outside Britain and Ireland is disputed and it apparently has no earth bank.

http://en.wikipedia.org/wiki/Goseck_circle