Instead of throwing insults, know what you are talking about first. It’s a propaganda building.

Built by the Nazis.

Used by the Hitler to present himself as animal friend and lover of nature. And by other Nazis for representative and diplomatic events. About today’s use of this building: Wikipedia article

“The Kehlsteinhaus interior offers little information about its past. Photos displayed and described along the wall of the sun terrace document the preconstruction location and later history.[23]“

The building now is owned by a charitable trust and operates as a restaurant, offering indoor dining and an outdoor beer garden. It is a popular tourist attraction due to its historical significance.

I don’t think it’s fitting to use it as “cautionary reminder”. It’s also quite absurd to compare it to Auschwitz.