This cache showcases a 19th-century fortress built by the Austro-Hungarian Empire to be used as a military base until the end of World War II.
Your task is to find two numbers.
Number ABC. Enter Wachhaus Caballa at the posted coordinates and look for the number in a small hole in the wall, on the second floor. You will need balancing skills or a ladder.
Number XYZ. Enter the tunnel outside the Wachhaus and look for a ladder going down. Descend 65 steps and look behind you and you'll see the number. You will need a headlamp and some courage.
Enter coordinates N42° 25.ABC E18° 32.XYZ to the geochecker below to see instructions for the final cache.
Enjoy!