The military legacy of Vis is everywhere if you know where to look — and increasingly accessible thanks to a small group of local operators running off-road tours. The most impressive sites are the submarine pens at Rogačič (just south of Vis town), carved into a cliff with steel doors and a freshwater channel; the rocket-launcher tunnels above Stončica; and the round artillery emplacement on the ridge above Komiža, with its 360-degree view of the open Adriatic.
Military Tours Vis and Alternatura both run guided 4x4 tours covering the main installations; they take three to four hours and cost around €50. Going on your own is possible but you'll miss most of the smaller installations, and some require keys or climbing equipment. The submarine pens are the easiest to find unguided — there's a footpath from the road around the bay.