Indeed, it is a horrible place. The coloring of the photographs shows very well the expression and the darkness of that place that caused pain and panic to thousands of people. The worst version of human beings is seen in this kind of places. Pain, permanent.
The strongest thing is to assimilate. After going you must have asked yourself thousands of questions.
Your words are very fitting, thank you 🙏 And yes, visiting such a place makes you find even more questions instead of answers.