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Photo: PictureObelix, CC BY-SA 3.0 at via Wikimedia Commons
A 13th-century subterranean chapel beneath the former Chapel of St Mary Magdalene (no longer standing, but outlines have been traced on the pavement directly south of Stephansdom). This chapel served as the tomb for a wealthy Viennese family and was completely forgotten until construction of the underground in 1975. A portion of it can be viewed for free from a window in the U-Bahn station.
The Vergilius Chapel is an underground crypt next to the Stephansdom in Vienna. It is rectangular in form, with six niches. Today, it lies approximately 12 meters beneath the Stephansplatz.
© OpenStreetMap contributors
St. Stephen's Cathedral
Yet another patchwork of architectural styles, but predominantly Gothic. None of the original construction remains, the oldest extant sections are the thirteenth century Giant Gate (Riesentor) and Towers of the Heathens (Heidentürme), both of which are Romanesque. In 1511, building in Gothic style ceased due to being out of fashion. The main altar has a Baroque panel showing St. Stephen, Christianity's first martyr. The organised tour is worth it, since some of the finest works of art in the cathedral can only be seen with a guide, such as Emperor Frederick III's red marble sepulcher and the immense Gothic carved Altar of Wiener Neustadt. Those interested in attending Mass may come Saturdays at 7PM for an English service.
literally: staff in iron
The remaining midsection of a medieval nail tree (Nagelbaum). Over the centuries hundreds of nails have been hammered in both in thanksgiving and for good luck. The tree figures in a number of local legends.
Cathedral and Diocesan Museum
A collection of liturgical implements, illustrated manuscripts, altarpieces, and sculptures.
Mozart House
This is the Viennese residence of Austria's most famous composer, Wolfgang Amadeus Mozart, and a branch of the Vienna Museum.
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).
Jewish Museum Vienna
A museum documenting the history of Vienna's substantial Jewish community which included Zweig, Freud, Herzl, Mahler, and Schoenberg. Three sites are available for one combined ticket: two museum sites and the main synagogue. Attached to the museum at Judenplatz are the archaeological remains of a medieval synagogue. The Stadttempel, the only historical synagogue in Vienna to have survived World War II, is accessible on through the guided tour.