Alt-Regensberg Castle is a hill castle which was built about the mid-11th century AD by the House of Regensberg in the Swiss municipality of Regensdorf in the Canton of Zürich.
Wikipedia https://en.wikipedia.org/wiki/Alt-Regensberg_Castle
Address 37 Burghofstrasse, Altburg 8105, Switzerland
Coordinates 47°25'42.769" N 8°28'55.215" E
