The Vietnam Military History in Hanoi is filled with artifacts and relics of war. To get the most out of it, I’d recommend either hiring a local guide or to get an audio tour.
Without either of these things, many of the signs simply say what the artifact is (which you can see…) and the date it was used. The exterior of the museum is where all the tourist photos happen. US helicopters, crashed planes, tanks and more will help you envision the scale of war.