Developer Robin von Hardenberg holds a tablet computer that runs his Timetraveler augmented reality app at Bernauer Street in Berlin, September 26, 2014. The app superimposes historic footage of scenes that unfolded when the Berlin Wall was erected in 1961 onto today's location when pointing the tablet at the specific spot. Berlin marks this year the 25th anniversary of the building of border fortification that divided the east and the west of the city. REUTERS/Thomas Peter (GERMANY - Tags: SCIENCE TECHNOLOGY SOCIETY ANNIVERSARY)