We had the great opportunity to be involved in a project that uses augmented reality for something really useful: contextual information to help you experience historical sites. We helped SPUR.labs and raumHOCH bring the concept to life in the form of an iOS app prototype that shows augmented, vanished buildings and original media in a guided audio tour that can be experienced on the grounds of the memorial site of the former Sachsenhausen concentration camp. It was a challenge to get the tracking right on an almost empty site, but the result was definitely worth it.