The Auschwitz-Birkenau State Museum encompasses the remains of the largest Nazi German concentration and extermination camp complex, where more than a million people — the vast majority of them Jews — were murdered between 1940 and 1945. The museum occupies two main sites: Auschwitz I (the original camp, about 3 km from Oswiecim town centre) and Auschwitz II-Birkenau (the larger extermination camp, about 3 km further west).
Auschwitz I is the starting point for most visits. The infamous "Arbeit Macht Frei" gate stands at the entrance; beyond it are the brick barracks, now converted into exhibition halls, that document the camp's history, the conditions prisoners endured, and the mechanism of the Holocaust. Block 11 — where prisoners were executed by shooting against the "Death Wall" — and Block 10 — where prisoners were subjected to medical experiments — can be visited. The exhibitions are thorough, moving, and at times extremely difficult.
Auschwitz II-Birkenau is a different kind of place — vast, open, and in many ways more devastating than the compact original camp. The rail spur running through the iconic gatehouse leads to the selection ramp where arriving prisoners were divided into those immediately killed and those temporarily spared. The ruins of the four crematoria and gas chambers (blown up by the retreating SS) lie at the far end of the site. The scale of what happened here — the camp covered 175 hectares — only becomes comprehensible on foot.
Visiting: Guided tours are strongly recommended. The museum offers free entry to the permanent exhibitions, with timed entry slots that must be booked in advance, particularly from April to October. Tours leave in multiple languages throughout the day. Allow at least 3–4 hours for both sites; a full day is not excessive. Photography is permitted in most areas but must be done with sensitivity.