Yes, you must bring a valid photo ID, such as your passport or a national ID card, to visit the Auschwitz-Birkenau Memorial and Museum. This is a strict requirement for all visitors because the museum now issues personalized tickets that are linked to the name on your identification. Upon arrival, you will go through a security check similar to an airport's, and a staff member will verify that the name on your ticket exactly matches the name on your passport. If you do not have your ID with you, you will be denied entry, regardless of whether you have a pre-booked tour or a valid ticket. This measure was implemented to prevent the unauthorized reselling of tickets and to ensure the security and solemnity of the site. It is also important to note that the name on your booking must match your ID "character for character," so ensure there are no typos when you make your reservation.