Former Military base nearby Prague in the Kelcany town. Street Dolni Kasrana.
Website of the base https://www.hrabarev.cz/eng/paintballove-hriste/praha-vychod-klecany
You can drive by car on the highway D8 from Prague towards Usti nad Labem and take first exit after traffic sign "end of Prague" to the Zdiby/Neratovice. The entrance to the military base is close to crossroads Dolni Kasarna and Za Kasarnami streets.