Katie D.
Yelp
Warning: be prepared to spend an eternity here. That's not in a bad way, but rather a good thing. This place is HUGE. I mean really huge. You could spend your entire day here and not feel cheated. It has everything, I mean everything. It's the most vast museum I've ever seen.
There are exhibits on anything and everything. Boats (including one you can walk through), planes, aeronautics, computers, trains...it even has a working model train. It's absolutely fascinating and adorable.
There's emphasis of course on German inventions, such as the diesel engine and Zeppelins. There are models of various models of Zeppelin and other airships throughout this section, along with early airplanes, such as the one the Wright Brothers used. There's a section on subways and a replica of a subway tunnel. Lots on space flight and information on each of the eight planets (ahem, the space in between the wall and Neptune is sadly obvious that they took out Pluto). Various models of rockets, space shuttles, and other things used for space flight are featured. As someone who lived on Space Coast for a couple years, this in particular held my fascination.
There's also a section, and I mean a huge section that could be a museum in itself on musical instruments. There's a room just of various pianos, a section on brass instruments, etc. Every section is like this, huge enough to be its own museum if it were split up.
Given the length of time one would spend here, of course you're going to get hungry. No worry. There are two restaurants, one more casual offering only a couple things, and another that...it's not that it's more upscale, it's just much bigger and looks newer. It has an insane number of meals on offer, all cafeteria-style (you tell the person which dish you want). Loads of options for bread, dessert, drinks, etc. Nothing is really overpriced either, especially considering both places are inside a museum where you're really at their mercy.
If you're only going to check out one museum while in Munich, or you're there for only a day or two, this has to be at the top of your to-do list. It's definitely worth seeing and devoting a lot of time to.