Steinernes Herz, Memorial stone in Osterwald forest near Springe, Germany.

Steinernes Herz is an upright limestone block about 3 metres tall on a hillside terrace at roughly 280 metres in the Osterwald, west of Wülfinghausen Monastery. It stands some 10 metres off the Pionierweg on the valley side, ringed by smaller boulders in a circle about 5 metres in radius. A heart-shaped recess on its south face holds the carved date 1878.

The stone was probably erected in the 19th century by pioneers from Minden. Its heart symbol and the carved year 1878 may refer to Georg V, the last king of Hanover, who died in exile in Paris on 12 June 1878. The Latin inscription quotes the closing line of a ten-line Alexandrine poem published by Martin Opitz in 1630.

The Latin inscription below the heart reads "Siste, viator, hic morare!" ("Stop, wanderer, linger here!"), quoting the closing line of a ten-line Alexandrine poem published by Martin Opitz in 1630. The meaning of the heart symbol and the number 1878 is not known; one suggestion links 1878 to Georg V, the last King of Hanover, who died in Paris exile on 12 June 1878.

The stone stands about ten metres off the Pionierweg on the valley side, on a hillside terrace at roughly 280 metres elevation. The trail climbs in a half-circle from the Forsthaus Wülfinghausen below the Königskanzel lookout to the ridge. The ring of smaller boulders around the block has a radius of about five metres.

The Latin inscription below the heart quotes the closing line of a ten-line Alexandrine poem published by Martin Opitz in 1630, rendered in German as "Steh, Wanderer, hier verweile!" The heart symbol and the year 1878 have no documented explanation; one suggestion links 1878 to Georg V, the last King of Hanover, who died in Paris exile on 12 June 1878. The stone is a protected single monument under object ID 28823066.