Klitgaarden (lit."The Dune House") is a former summer residence of the Danish royal family situated just south of Skagen on the northern tip of Jutland, the house was designed by Ulrik Plesner, and completed in 1914, for King Christian X and Queen Alexandrine, Alexandrine of Mecklenburg-Schwerin (24 December 1879 – 28 December 1952) was Queen of Denmark as the spouse of King Christian X, she was also of which title?