The biggest transformation has got to be the Potsdamer Platz; now a showcase for urban renewal having previously had the life sucked out of it by World War 2 and the Cold War. In 1976 this was a wide desolate death strip which has now been totally rebuilt with imposing new buildings.
See image P1015257 to see how this viewpont looks now in 2013
Ref: Y10
Location: Berlin
Photographer: Stafford Steed LRPS, CPAGB