Toompea Castle is a castle on Toompea hill in the central part of Tallinn, the capital of Estonia. Though the castle is located on an ancient stronghold site in use since at least the 9th century, much of the current building was constructed in the 13th and 14th century by the Order of the Brethren of the Sword. Today the castle houses the Parliament of Estonia, which meets in a building designed by Eugen Habermann and Herbert Johanson.Photograph: Abrget47j