Built 1000.
Burg Greifenstein is a castle in Lower Austria, Austria, overlooking the Danube. Burg Greifenstein is 227 metres (745 ft) above sea level. Approximately opposite to Burg Greifenstein is Burg Kreuzenstein, on the north shore of the Danube.
From Wikipedia, CC BY-SA 4.0.
Stand in front of it, point your camera, and LookUp names it from where you are, with these facts on the card. Every landmark you capture turns to colour on your Vienna map.
Download on the App Store