While expanding the underground parking lot of the local Sparkasse bank, construction workers stumbled upon the ruins of a mikwe, or ritual Jewish bath. The basin dates back to the 1300s and is still fed by ground water. The Jewish community was driven out of Kaiserslautern in 1398 and so this bath and the whole Jewish ghetto feel into disrepair. Well-preserved in a special room under the bank, you can only visit the Milkwe on a city tour.