>>508770181
Let's just talk about Auschwitz.

Crematorium 1 is a "soviet reconstruction", it's not in original condition. The soviets knocked down internal walls to create one large room, presented as the gas chamber. You can see imprints on the floor where toilet fixtures once stood, the soviets ripped them out.
Crematorium 4 & 5 do not exist. They got demolished or burned down sometime after liberation. It's not clear when or how this happened. Also these buildings were not crematorium, they were for other purposes, but it's claimed they were converted into crematoriums.
There's also outdoor burning pits. They did burn bodies in these pits. Although allegedly they were digging up some corpses that polluted the groundwater to burn them. The fires we have pictures of are small, and not thousands of bodies large.

As for Crematorium 2 & 3
-- no blue staining on the walls, or any cyanide residue on the walls. People who've done these tests have been arrested and imprisoned
-- allegedly the doors were open in 30 minutes, which isn't enough time to get the cyanide out of the room.
-- ventilation intake is near the floor, and would have been blocked with bodies. Also cyanide rises to the ceiling.
-- Allegedly 15 minutes/body, which is impossible. Also overloading with 3-4 bodies made it take half as long, ridiculous nonsense
-- Allegedly half the bodies were dragged out through the dressing room, up the stairs, and out to the burning pits. No rollers or stretchers are mentioned, the bodies were dragged. 1 body every 20 seconds had to be dragged out.
-- Eyewitnesses got the color of the pellets wrong. Said the bodies were "burning hot". Got the color of the skin wrong.
-- The german plans call these rooms "morgues", aka they were storing bodies of people who died from disease for cremation. That's why they were built into the ground, to keep the bodies cold