This Carmelite convent, 6km southwest of Heiligenkreuz, was the site of the famous Mayerling murder-suicide of Emperor Franz Joseph I and Empress Elisabeth's son Rudolf and his young lover, Baroness Mary Vetsera. It's something of a macabre curiosity for Austrians (the scandal continued long after the monarchy itself was no more), but the convent post-dates the event and there's nothing to actually see.