A great place for walking and sightseeing. There is a view of the Eiffel Tower. A large military museum and an architectural monument. Entrance to the territory is free, but through inspection, and to the museum is 15 euros. It is advisable to walk in good weather, as there are many open spaces.
It's something.... The building itself and the architecture are exciting, and in combination with an audio guide in Russian - ecstasy. History lovers will have a lot to see and learn here. I've spent the whole day here myself and would like to go again if I have the opportunity. It surpasses the Louvre many times in terms of saturation, in my subjective opinion.