Come see Vienna's oldest abbey, and its highlight, the Museum in the Scots Abbey, filled with countless valuable treasures. The Scots Abbey was founded in 1155, and it is home to Benedictine monks originally from Ireland.
Among the treasures are the panels of the Scots Altar, a central work of Gothic panel painting, created by an anonymous artist who may have migrated from Nuremberg. Two other panels demonstrate what Vienna looked like around 1470; they are the oldest topographical illustrations of the city!
You should also make sure to see the panel by Peter Paul Rubens, early Dutch landscapes and a portrait of the Austrian Baroque artist Franz Anton Maulbertsch. And there's much more to see, such as antique furniture, liturgical utensils, valuable liturgical vestments, manuscripts and more.
Also check out the Schotten Church (Schottenkirche), a parish church attached to the Schottenstift, whose earliest version was a three-aisled Romanesque pillar church. The church was destroyed and restored several times throughout the generations. It was rebuilt in a Baroque style after 1638. The church's interior has multiple chapels with a new altar-piece in the prelates' hall. The high altar was built after sketches of Heinrich Ferstel, with glass mosaics. You should also see the gorgeous ceiling paintings.