Like many cities in Europe, Dresden was completely destroyed in the 2nd World War. Unlike their British counterparts who were complete morons, the Germans decided to re-construct their historic cities using old photos and plans. During the Communist occupation Dresden was left to fester as a reminder of the horrors of war and presumably as a way of cowing the population.
After the Berlin Wall was knocked down by Bono and Geldorf, the West German authorities made a huge effort to restore the centre of Dresden to its former glory.
For example the Zwinger
A pleasant cruise down the Elbe to Schloss Pillnitz