Hanička was system of military fortresses built in the 1930s, that should be to serve as a defense against the Nazis. The individual forts are connected in subterranean by creepy long tunels.
When Germany came to power in 1933 Adolf Hitler and the massive arms industry began to break out, it was clear to everyone that Europe was in serious danger.
Czechoslovakia was one of the most endangered states, as the German population in the border area in many cases formed the majority of the population in that region and increasingly demanded connection to the empire.
This fortifications should keep the first enemy up until the arrival of the Allies, especially France and England, who have never arrived because of fear.
In a massive reinforced concrete wall on the surface, the holes are visible after the tank is hit.
In underground part of this military fortress is also dental surgery.