9 5 6 , ▁and ▁until ▁ 1 9 7 0 ▁it ▁was ▁the ▁home ▁of ▁the ▁Municipal ▁Art ▁Collection . ▁The ▁Louis ▁Spo hr ▁museum , ▁closed ▁by ▁the ▁Naz is ▁in ▁ 1 9 3 3 , ▁was ▁re - open ed ▁in ▁the ▁building ▁in ▁ 1 9 6 7 . ▁It ▁included ▁four ▁display ▁rooms ▁and ▁an ▁archive . ▁ ▁The ▁displays ▁presented ▁the ▁viol in ist ▁Louis ▁Spo hr ▁and ▁other ▁viol in ists ▁and ▁viol ins ▁of ▁the ▁period . ▁In ▁ 1 9 7 2 ▁the ▁Brothers ▁Gr imm ▁exhibition ▁was ▁moved ▁to ▁the ▁ground ▁floor ▁of ▁the ▁palace . ▁In ▁ 1 9 9 9 ▁the ▁Brothers ▁Gr imm ▁Museum ▁took ▁over ▁the ▁entire ▁building . ▁ ▁The ▁Brothers ▁Gr imm ▁exhibition ▁has ▁since ▁moved ▁to ▁a ▁nearby ▁museum , ▁the ▁palace ▁is ▁now ▁closed . ▁ ▁Str ucture ▁The ▁Belle vue ▁Palace ▁is ▁the ▁only ▁palace ▁from ▁the ▁early ▁ 1 8 th ▁century ▁in ▁K ass el , ▁since ▁the ▁others ▁were ▁destroyed ▁during ▁World ▁War ▁II ▁or ▁in ▁an ▁" anti - fe ud al " ▁demol ition ▁wave ▁in ▁the ▁ 1 9 5 0 s . ▁The ▁building ▁has ▁simple ▁but ▁elegant ▁fac ades , ▁broken ▁only ▁by ▁a ▁slight ▁cor nice ▁above ▁the ▁ground ▁floor . ▁It ▁is ▁three ▁stories ▁high ▁and ▁almost ▁square , ▁with ▁two ▁side ▁wings ▁on ▁the ▁rear ▁garden . ▁The ▁street ▁front ▁has ▁a ▁bal con y ▁above ▁a ▁classical ▁portal . ▁The ▁building