Napoleonstein, Memorial monument on Windknollen hill in Jena, Germany.

The Napoleonstein is a stone monument on the Windknollen, a 363-metre hill northwest of Jena. Its south face bears a gilded N and crown above the date 14 October 1806; the north face carries a Golo Mann quotation, the east face lists distances from the stone to Napoleon's stations from Paris to Longwood, and the west face names the bodies that set the stone in 1992.

The monument commemorates the Battle of Jena on October 14, 1806, when French troops defeated the Prussian army. This event was a turning point in the Napoleonic Wars and changed the political landscape of Europe.

The north face carries a quote from historian Golo Mann about Germany's century-long fascination and hatred for Napoleon. The south face shows a golden N and crown above the battle date, 14 October 1806, while the west face names the groups that set the stone in 1992.

The monument sits on a hill at an elevation of about 363 meters (1,190 feet) and is reachable as a hiking destination from nearby areas. The location is accessible by car and works well for a several-hour outing.

The east side of the stone shows distances to important places in Napoleon's life, about 700 kilometers (435 miles) to Paris and about 503 kilometers (312 miles) to Waterloo. These measurements reveal the geographic perspective and mark the key locations of his career.