Askanierturm, Observation tower in Schorfheide, Germany.

Askanierturm is a 12-meter round tower of fieldstone on the Schlossberg hill at the southwestern shore of Lake Werbellin, near Wildau in the Schorfheide municipality. It has a balcony and a crenellated brick parapet at the top. The tower was built in 1879 to a design by Oskar Büscher, based on an idea by local poet Friedrich Brunold.

The tower, built in 1879, recalls the Ascanian castle of Werbellin that stood on the Schlossberg. The castle was first mentioned in 1247 and is thought to have been founded between 1211 and 1215 under Margrave Albert II; it was probably destroyed by fire by the mid-14th century. In the mid-18th century, building remains and medieval weapons were found during construction of the Werbellin Canal under Frederick the Great.

The tower's name recalls the Ascanian dynasty, under whose rule Werbellin Castle was built on the Schlossberg in the 13th century. The local poet Friedrich Brunold (August Ferdinand Meyer) proposed the tower and won Prince Carl of Prussia as a supporter; it was inaugurated on 2 October 1879. In 2009 the tower and its surroundings served as a backdrop for the fairy-tale film Rapunzel, with Suzanne von Borsody as the sorceress.

The tower stands on the Schlossberg hill at the southeastern edge of Wildau, a district of Eichhorst in the municipality of Schorfheide. Reach it on foot via forest paths; the ground is uneven, so wear sturdy shoes. The tower was reconstructed in 1991 by Eberswalde foresters and local heritage volunteers.

In 2009 the tower and its surroundings served as a backdrop for the fairy-tale film Rapunzel, with Suzanne von Borsody playing the sorceress. The brick crenellations and balcony made the tower a fitting setting for the production.