The third oldest theatre in Prague opened 15 days after the National Theatre fire in 1881. From its early days as a circus arena where magic, circus and “midget shows” were held, the theatre has grown into a renowned venue for musicals and operettas. The Karlín Musical Theatre boasts the largest historic theatre for nearly 1,000 people.
Source: https://www.prague.eu/en/object/places/178/karlin-musical-theatre-hudebni-divadlo-karlin