If you find yourself with a few more days to spare and you don’t mind traveling 16 miles, take a look at Ludwigshafen. This vibrant destination boasts plenty to keep you busy. Among your first few stops here should be Planetarium Mannheim, Mannheim Water Tower and Luisenpark Gardens. Locals will also probably point you in the direction of Mannheim, 18 miles away. If you can only see one attraction here, make sure it’s Planetarium Mannheim. (But we’re also huge fans of Mannheim Water Tower and Luisenpark Gardens.)