Beyond Vienna University’s main building, some travelers opt to visit the Natural History Museum Vienna Collection of Anatomical Pathology, housed in the Narrenturm, a cylindrical structure that’s one of the world’s oldest mental health institutions, or the Botanical Garden of the University of Vienna (Botanischer Garten). Main building tours cover architectural and art-historical highlights such as the grand cloistered Arcade Court, the majestic Great Reading Room, and the Main Ceremonial Chamber with its Klimt murals (now copies). Otherwise, admire the spectacular exterior from a Segway, bicycle, e-scooter, or walking tour, from the Ring Tram sightseeing tram, or on a photography excursion by day or night.