In 1969, three secret facilities appeared in Czechoslovakia, which were created in order to keep Soviet nuclear weapons secret from the "West" in case of war, so that Czechoslovakia would become the forefront of missile deployment in Western Europe.
Two of these bunkers are now abandoned, like this one - "Javor-50" located in the very west of the country, or "Javor-51", which is located to the north, and "Javor-52" has been turned into a museum.