Gusen Concentration Camp Memorial, at the site of the KZ-Gusen I crematorium (No. 1 on the photo above). On the right, original camp gate posts that still exist at the site (No. 3).

The Gusen crematorium oven in 1945, after its capture by the U.S. Army, and the crematorium memorial today.  (U.S. Army Signal Corps photo)

The main entry to the camp was through the so-called Jourhaus, an SS administration building (similar to Dachau) - No. 2 on the aerial photo. The Jourhaus is today a private residence. The Jourhaus gate appears on the far left of the period photo, which was taken from just outside the camp area, near the location of the gate posts shown above (No. 3).  (KZ Memorial Mauthausen)

SS barracks and administration buildings were located adjacent to the Jourhaus, and some of these still exist today (white No. 15 on the aerial photo).

The main purpose of the Gusen I camp was to provide slave labor in the adjacent rock quarry. This huge rock crusher was positioned over a rail line that carried the gravel and crushed rock to various construction sites. The rail line was removed after the war, and the rock crusher fell into ruins. (No. 4 on the aerial photo)

Plan of the Kellerbau tunnel system, adjacent to the Gusen II camp. The dotted lines show parts that were either never completed, or destroyed by the Soviets after the war. In 2009 or 2010 the main existing entrance was reconstructed and closed, but there has been some discussion about opening this tunnel as a memorial, similar to Ebensee.

On the left - an Allied aerial reconnaissance photo from April 1945, showing the Gusen I and II camps (# 13 and 19), the quarry site (#21), and the entrance to the Kellerbau tunnels (#31). On the right - plan of the B-8 Bergkristall tunnel project in nearby St. Georgen.  (from post-war Allied reports of the Combined Intelligence Objectives Sub-Committee (CIOS), Imperial War Museum, London)

Two views of the B-8 Bergkristall tunnel system taken in May 1945, after the U.S. Army overran the area.  (U.S. National Archives, RG 111SC-231581)

These photos show the remains of concrete bunkers at one of the entrances to the Bergkristall system. These bunkers were probably built to protect the tunnel entrances, or for final assembly of the Me 262 fuselages, in common with other such sites. These bunkers and tunnel entrances were blown up by the Soviets in 1947.

Most of the entrances to the tunnel system had concrete portals, but the majority of these were removed in the 1960s, when the hillside was cut back, leaving this large open field where the tunnel entrances had been. The remaining parts of the tunnels were buried, except for the entrance below. The view on the left below shows this entrance ca. 2000, when it was accessible. In the mid-late 2000s, the Austrian government purchased the site and filled in most of the tunnels through holes bored from above, in the process putting in this modern doorway at this tunnel entrance.  (Bundesarchiv, 192-003)

Tours for the public are sometimes held in a part of the tunnel system that was not filled in, but has been sanitized from its 1945 condition. These photos show Tunnel 0 and Tunnel A (above), a side corridor off Tunnel 0 with machinery mounts (below left), and a side chamber off Tunnel A with a modern ventilation duct (below right). The stacked roll-like or log-like structures seen in the photos on the right above and left below show where corridors have been blocked off and the tunnels behind filled in from above.

These two photos taken after capture by the U.S. Army show the state of the tunnels in 1945. On the left are Me 262 aircraft fuselages in one of the tunnels. On the right, another tunnel was used for workshop space.  (U.S. Air Force Historical Research Agency)

On the left above is a hydraulic press for forming Me 262 fuselage parts, found in the tunnels in 1945. On the right is a corridor junction in Tunnel A. The ventilation ducting comes from a modern ventilation shaft drilled in this area. The side chamber at the end originally housed a transformer. Below is an armored concrete cover for a ventilation shaft, blown up after the war and left in ruins today.  (above left - U.S. Air Force Historical Research Agency)

Left - One other original entrance to the Bergkristall system exists today. This is the entrance to Tunnel G3, but the corridor is blocked shortly inside, and the rest of the tunnel behind was filled in from above. Right - the St. Georgen shooting club meets at the original SS shooting range.