Drottningholm Palace, Stockholm, Sweden - private residence of the Swedish royal family, images via Wikipedia
Kalmar, Sweden- not Nybro like another pinner wrote. This is an aerial view of Kalmar slott (castle)
Uppsala Castle, Uppsala, Sweden.
Drottningholm Palace on the island of Lovo is a Unesco World Heritage site and lies about 11km west of Stockholm city center dating from 17 century, the palace is now the official residence of the Swedish Royal Family
Läckö castle at lake Vänern in Västergötland Sweden
Hohenwerfen Castle Werfen, Austria
The Palace Park - Drottningholm Slott, Stockholm, Sweden