Karlovy Vary or Carlsbad is a spa town situated in western Bohemia, Czech Republic, where the rivers Ohře and Teplá meet, approximately 130 km west of Prague. It is named after Charles IV, Holy Roman Emperor and King of Bohemia, who founded the city in 1370. It is historically famous for its hot springs (13 main springs and about 300 smaller springs). It is the most visited spa town in the Czech Republic, so you should definitely stop by too and taste at least 3 springs. Take a selfie with all the springs you´ve tasted.
You can find an overview of all the springs on this page.