Grand Kremlin Palace, Moscow, Russia, breathtaking as all of them are in Russia! The Grand Kremlin Palace was built on orders from Tsar Nicholas I in the mid-19th Century. The architects outdid themselves!
"The Grand Kremlin Palace, also translated Great Kremlin Palace, was built from 1837 to 1849 in Moscow, Russia on the site of the estate of the Grand Princes, which had been established in the 14th century on Borovitsky Hill. Designed by a team of architects under the management of Konstantin Thon, it was intended to emphasize the greatness of Russian autocracy."
It's The Georgian Hall of The Kremlin Grand Palace, The Red Square, Moscow ~ this hall is the largest between five grand halls of the Kremlin Grand Palace. It was named in the honor of Russian Order of St George, founded by Catherine II of Russia in 1760s to award soldiers and officers of the lowest level of Russian Empire. The hall is decorated by gold, crystals and 200 varieties of most precious wood.