The Peles Castle in Romania is considered one of the world’s most beautiful. It was built between the years 1873-1914 by orders of King Carol I. It's intrior was created by some of the most important decorators of the time. Just look at the hand carving of the balustrade and the staircase itself, utterly amazing.
Amazing Architecture - Grand Staircase in House of Scientists, Lviv (Lemberg), Ukraine <= before 1945 = Lwów, POLAND => see history, actual till today ! https://www.pinterest.com/pin/349803096033334209/ & https://www.pinterest.com/szlachcic/news-ukraine-crisis-media/