Germany's architectural beauty comes mainly from a blend of medieval castles and cathedrals, combined with the steep roofs of "half-timbered" houses, many of which are also hundreds of years old. It should come as no surprise that the landscape in the former DDR is almost identical, except for a few city blocks here and there with the aforementioned functional, Soviet style office or apartment buildings. The only other clues that this part of the country isn't quite the same are that the farms are enormous (farmers were forced into co-ops, combining their private lots into massive communal farms), and there are far more derelict houses and factories - most likely government-controlled manufacturing industry that collapsed in the competitive market.
The museums portray a disturbingly oppressive environment before 1989. The Stasi - the State Security apparatus - appears to have been a frighteningly paranoid and incredibly pervasive organisation. With the assistance of teachers, they recruited suitably patriotic children from schools to groom for lifelong careers as agents, and maintained incredibly comprehensive surveillance over the entire population. They even went so far as to maintain a collection of sealed glass jars containing scent samples of hundreds of people so that they could be tracked by dogs!
The purpose of the Stasi really appears to have been to ensure the security of the government by keeping tabs on those of its citizens who might have the courage to speak out against it. The penalty for opposing the government was equally disturbing. Numerous prisons - many of them former concentration camps - are scattered throughout the former Soviet territories. These were crowded with people, many of whom simply "disappeared" in the early period of Soviet occupation, or in later years were more formally arrested and incarcerated for persisting in their attempts to leave the DDR or oppose the regime.
The movie "The Lives of Others" presents an excellent portrayal of the operations of the Stasi. We watched it the other day (in German), and had I not seen the museums and exhibits beforehand, I doubt I would have believed it to be entirely plausible.
In Berlin, there is no sign of the wall which once divided the city. However, the museum at "Checkpoint Charlie" presents a fascinating history of the history of the wall and many of the attempts (both successful and foiled) to cross it. The museum opened while Berlin was still divided, and has collected some amazing artifacts, including modified cars and machinery used to smuggle people over the border, as well as ingenious home-made escape apparatus ranging from underwater scooters and SCUBA gear to hot air balloons and ultralights. Of course, the museum also relates the stories of those who failed to make it, or were so badly injured by either the gunfire from the guards or the anti-personnel measures that they died during the crossing.