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Photo: Gryffindor, CC BY-SA 3.0 via Wikimedia Commons
A second branch of the Jewish Museum on Dorotheergasse. Underneath the Judenplatz (the Jewish Square) is an underground medieval synagogue excavation. Amazingly, the synagogue was destroyed centuries ago, but its existence was remembered by the area's inhabitants up to the 20th century.
© OpenStreetMap contributors
Clock Museum
A collection of 3000 clocks of all types, including a prized 18th-century astronomical clock.
Roman Ruins Am Hof
Early Roman ruins from Vienna's earliest days as a Roman fort in the basement of the Fire Brigade Building.
This gothic church was used by sailors on the Danube river. Its name refers to the former location near the river. Communion celebrations are held in German, French, and Czech.
Neidhart Frescoes
The oldest secular wall paintings known in Vienna, in a 14th-century building. The frescoes were commissioned in 1398 and illustrate scenes from the life and poetry of the Viennese minnesinger Neidhart von Reuental.
This venue hosts special exhibits of internationally-renowned artists; past exhibits have displayed work by Egon Schiele, Oskar Kokoschka, Cézanne, Picasso, and Van Gogh.
St. Peter's Church
The church is believed to date back to the Middle Ages, and excavations suggest that the foundation may be far older than previously believed. The current structure was built during the Baroque period, and restored from 1998-2004 to return the paintings to their original colouring and brightness. There are regular organ concerts at 15:00 (free).