The camps are in the small town of Oświęcim, Poland, about 20 miles west of Krakow. My wife and I visited in August of 2016. The site is crowded, and you need to reserve your visit time online weeks in advance, although there are usually openings available early morning for drop-ins. Tours are given in many languages.
The blocks were designed to hold about 700 prisoners each after the second stories were added, but in practice they housed up to 1,200.
During the first several months, the prisoners’ rooms had neither beds nor any other furniture. Prisoners slept on straw-stuffed mattresses laid on the floor. After reveille in the morning, they piled the mattresses in a corner of the room. The rooms were so overcrowded that prisoners could sleep only on their sides, in three rows. Three-tiered bunks began appearing gradually in the rooms from February 1941. Theoretically designed for three prisoners, they in fact accommodated more. Aside from the beds, the furniture in each block included a dozen or more wooden wardrobes, several tables, and several score stools. Coal-fired tile stoves provided the heating.
The square photographs were taken with Kodak Tri-X 400 black and white film in a Rolleiflex 3.5E twin lens reflex camera. Film development: Kodak HC-110 dilution "B", 4:45 at 68° F. I cleaned spots and lint with Pixelmator software on a Mac Mini and resized to 2400 pixels for this blog. Click any picture to enlarge it. One photograph, that of the hallway, is digital from a Fuji X-E1 camera.