This is a striking hardcover book titled "Bramy Tragedii" by Adam Kaczkowski. In Polish and with translations in English, Russian, French, and more.
It features photographic documentation of various WWII concentration camps and execution sites in Poland.
It was published by Wydawnictwo Sport i Turysyka in 1989 and has 140 pages.
This book comes in good, pre-owned condition with some wear on the corners of the cover. It is without the dust jacket (see photos).