Blankenhagen Castle

It is supposed that there used to be fortified buildings on the two low mounds or mottes, and that a bailey was constructed on an outer island-like area.

The castle stood in the meadow landscape of the Aller valley about half a kilometre northeast of Grethem.

Of the two preserved castle mounds, which are devoid of any stone ruins, the higher one has a diameter today of about 25 m. It is roughly 4.5 m high and covered by bushes.

The castle site appears in the Royal Hanoverian Map Series (Kurhannoversche Landesaufnahme) of 1779.

The project was supported by the European aid programme LEADER+, because it had located castle sites in the Aller-Leine Valley area.