The Alpine Wall Looking like some sort of backwater Star Wars planet outpost, these in-cliff structures are part of Italy's World War II border defenses known as the Vallo Alpino. This particular outpost is known as the Opera Croda Sovra i Colsei.
This image is from the presentation "Via Ferrata - Protected Climbing Paths in the Dolomites - Ferrata Nord on Croda Rossa di Sesto".