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 White Drawing Room of Buckingham Palace. More
Amazing stairway in an abandoned palace in Poland
The Throne Room at St. James's Palace ~ London, England
Blenheim Palace, Oxfordshire, Birthplace of Sir Winston Churchill. (But only by accident! His mother was married to the younger son, not the Duke, & went into labor while at a dance there.)
plasterwork walls, diamond marble floor
Garden maze at Scone Palace in Scotland
The Rambagh Palace (former residence of the Maharaja of Jaipur), built in 1835, in Jaipur
World's Snaps: Kimsooja’s Room of Rainbows Crystal Palace Madrid
Palace of Versailles, one of the Louis XV suite... incredibly beautiful.