The Mayerling castle, a former hunting lodge southwest of Vienna, is now the Carmel of St. Joseph. It was acquired by Crown Prince Rudolf in 1886 and became the site of a tragic event on January 30, 1889. The Austro-Hungarian heir, Rudolf, died here along with his beloved Mary Vetsera.
The circumstances surrounding their deaths were officially kept secret, but it's now widely believed that a depressed Rudolf shot Mary Vetsera before killing himself. His father, Emperor Franz Joseph I, had the lodge rebuilt as a monastery for the Carmelite nuns to pray for his son's salvation. The neo-Gothic church was built so that the high altar stands on the exact spot of Crown Prince Rudolf's deathbed, serving as a solemn memorial to the tragic event.