If you have a few more days to spare and you’re willing to travel 19 miles, take a look at Worms. This lively place boasts plenty of things to keep you busy. St. Peter’s Dom should be high up on your list here. Nibelungen Museum and Jüdisches Museum are awesome attractions too. Located 20 miles away, Mannheim is another popular choice. If you swing by, be sure to check out Planetarium Mannheim, Mannheim Water Tower and Luisenpark Gardens.