Technik Museum Speyer & Sinsheim: German WWII Planes, Trains, Automobiles & a Sub
TWO Museums, 30 miles apart: Speyer & Sinsheim. Check it out and see what's in each at :
What is There to See? WAY too much....! Each museum has a number of WWII-specific exhibits in addition to thousands of cars, planes, boats, etc. and an IMAX theater. In a nutshell, the planes & sub are at Speyer, the tanks and more military display are at Sinsheim - the web site gives a good overview of what's where. Don't Miss the U-9 Sub at Speyer and the Panzers at Sinsheim.. Exhibits are both inside and outside. Both gift shops have an excellent selection of WWII books with many, many photos at a reasonable price.
How Long Does it Take? Seeing both in one day is a little too much - driving over for lunch and an afternoon at one or the other is perfect. Plan a 60 minute drive to Speyer and another 30 minutes to Sinsheim, then several hours for the museum. Both are worth seeing but Sinsheim has more WWII stuff.
What Else Do I Need to Know? Bring an umbrella so you don't miss the outside exhibits, and wear shoes compatible with climbing steps to the planes and descending into the sub. Parking is ample, and the museums are adjacent to the autobahn. The Speyer museum is also adjacent to the Speyer Dom (cathedral) and old town. The museums are open seven days a week;  both have restaurants and a Museum Shop. Be prepared for a pricey admission fee: Euro 12.50 for the museum only, and Euro 17 with the IMAX; see the website for group and special prices.

Highlights from Speyer:  Junker 52, Messerschmidt 109s, Kubelwagen, Schwimmwagen, U9 sub, Reichsbahn trains
Highlights from Sinsheim: multiple Panzers, US & German dioramas, extensive display cases, unirofmrs
Map & Directions to Speyer and Sinsheim