Ernst Moritz Arndt Tower, Observation tower and memorial on the Rugard in Bergen auf Rügen, Mecklenburg-Vorpommern, Germany

The Ernst Moritz Arndt Tower is a four-storey round tower of brick masonry on a landscaped hill with an outdoor staircase, on the Rugard northeast of Bergen auf Rügen. Its wide base storey with a surrounding gallery is divided by segmental-arch niches, the second storey has tall round-arch windows, and the third forms round-arch arcades of a covered gallery. A cast-iron spiral staircase leads to the fourth storey with its viewing gallery and glass dome; the tower is 26.7 m high.

A committee led by Rügen Landrat von Platen and Bergen mayor Dr. Richter formed in 1869 to raise funds for a monument to Ernst Moritz Arndt, and the foundation stone was laid on 26 December 1869, his 100th birthday. Berlin architect Hermann Eggert's design was chosen and he supervised the work throughout. Funds ran out after the first storey in 1873; Kaiser Wilhelm I gave 3,000 marks, and the 26.7-metre tower was completed in 1877.

The tower is a memorial to Ernst Moritz Arndt, born on Rügen in 1769; the foundation stone was laid on 26 December 1869, his 100th birthday. A committee chaired by Landrat von Platen and Bergen mayor Dr. Richter raised donations, and Kaiser Wilhelm I gave 3,000 marks when funds ran out after the first storey.

The tower sits on a hill that is accessible on foot and serves as a good starting point for sightseeing. Visitors should check ahead about access hours and days, as these may vary by season.

The tower's original brick-tiled roof hood was removed in 1944 to mount an anti-aircraft gun, and from 1945 to 1953 the Red Army used the building. The gun platform was demolished in 1955 and replaced by a wooden roof hood, itself superseded by the glass dome installed in the 2000–2002 restoration costing about 1.1 million DM.