This is the Paleontology Museum in Moscow. The current building (pictured here) was created in 1965, after Academician Yuri Orlov petitioned the government that the old building was becoming too cramped and unfit for the vast collection. The museum currently bears comrade’s Orlov’s name.
Their website: https://www.paleo.ru/museum/about/
More pictures inside.
I am also convinced Lemmy hates me and won’t let me upload the rest of the pictures. But they will come later, have no fear.