This is one of the most unusual 'museums' that I've been to. It's acutally an outdoor history lesson built on the location of a former nazi bunker/HQ and gives the history of the rise and fall of the nazi party through text, photos, and maps. It's written in German, so if Sie sprech kein Deutsch, you should buy the guidebook in your language from the information trailor (they're available in English. As for other languages, you will have to ask yourself). It is a somber experience, especially when you consider you are standing in the area of Berlin that was the center of the nazi command. As for content of the information, the guidebook wasn't as comprehensive as what is written on the displays.
If you in Berlin only to party and have a good time, this site might not be for you. I give it a 'high recommendation', not as a site to seek out like you would the Eiffel Tower or a famous dance club, but because if you are in Berlin and visiting the other historic sites, it will add to your travel experiences.
Also note - the Berlin Wall is directly behind the Topography of Terror.