The WW2 museum has a movie theater showing a 45 minute movie called "Beyond All Boundaries".
It's billed as "the only 4D movie in the world".
Picture a giant curved movie screen in front of you which fills your whole field of vision.
At one point, the screen is filled with a WW2 bomber flying towards you and flak is exploding all around it. During this, the front end of a bomber fuselage comes out of the ceiling of the theater and positions itself perfectly right in front of the movie screen where the movie airplane is. So what you're then seeing is the airplane coming out of the screen. And when the flak is exploding, it's synced to a shaking mechanism in the theater seats and you're actually feeling the explosions in your seat.
At another point in the movie, we're seeing a winter scene with snow falling. And simulated snow is released from the ceiling and starts falling on the theater audience.
There is a pit between the audience and the screen. And all during the movie actual physical props are coming up out of the pit to coincide with what's on the screen.
And it's not gimmicky. Everything is perfectly suited to complement what's being shown in the movie (which tells the story of WW2 from Pearl Harbor to Nagasaki).