Einsiedlerhaus is a historic building with an adjoint garden which is part of the former town wall of Rapperswil. Situated on the shore of Zürichsee lake, Einsiedlerhaus is the eastern extension of the fortification of a neighbouring Capuchin friary.
The building was probably built in the 13th century, or maybe two centuries earlier. The Zürichsee lake shore area of Endingen was given by the Einsiedeln Abbey to the Counts of Rapperswil as a fief – the abbey is still owner of the land, including the area where the 16th-century Capuchin friary was built. That's why the building traditionally was named Einsiedlerhaus, meaning 'house of the Einsiedeln abbey'. The ferry station and wineyard was mentioned here in 981 AD.
Today Einsiedlerhaus hosts Haus der Musik, a youth music school.
References:Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.