Vienna is always worth a visit!

Even if you hurry, it is nearly impossible to see all the sights of Vienna during one visit. Luckily a lot of them are close to Pension Dr. Geissler, like St. Stephen's Cathedral, Hofburg Palace, the Opera House Staatsoper and the Capuchins' Crypt (Imperial Crypt). Before leaving, you should see at least a few of the following sights:

St. Stephens Cathedral
Hofburg
Spanish Ridingschool
Schönbrunn Palace
Opera house
Secession
Capucine's Crypt
Viennese Giant Ferris Wheel
Prater
Danube Tower