Peterskirche

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.

A collection of 3000 clocks of all types, including a prized 18th-century astronomical clock.

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.

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.

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.

This museum houses a collection of artifacts from the Roman settlement of Vindobona, as Vienna was then known. There are Roman ruins in the cellar of the museum, first discovered during construction work in 1948, and for many years only accessible to the public via a narrow staircase, before the building was transformed into a full-fledged museum 2008.