The Grand Hotel Vienna is of greatest historic importance, as it is historically seen the oldest of all remaining 5star luxury hotels in Vienna. This is of course only theoretically true - it wasn't a hotel bewteen 1958 and 1994, when it reopend, totally rebuilt. Its historic facade was the only part of the old building that had to remain intact.
But what a story it can tell about all these years between its official opening in 1870 and 1958, and from 1994 to date! It was to our knowledge the first purpose built building, designed as a hotel, and the first to be called "Grand Hotel" on the European continent, most other hotels adopted this name only later.