This exuberant Baroque masterpiece right in the centre of Vienna is on the site of a 4th century church. It was commissioned in 1703 by Emperor Leopold I and designed by a number of architects - notably Gabrieli Montani. However it was completed by 1733 under the supervision of the great Johann Lukas von Hildebrandt and it is with his name that the church is usually linked. It can be viewed as a triumphant remodelling of St Peters in Rome.
The wonderful fresco of the Assumption in the dome is by Michael Rottmayr.The pulpit is by Mathias Steindll. The statue of St John Nepomuk to th eright of the choir is by Lorenzo Mattieli. The painting above the high altar of the healing of hte lame man at the Beautiful Gate by Peter and James is by MartinoAltomonte.
My memories of it include a Sunday Mass concluded with Bach Fantasia in G BWV572 : it doesnt get better than this! Then at Christmas they have a display of historic and new cribs in the crypt.
To get the atmosphere try the first video below starting with bells, then the horse drawn carriages and the church interior - brings it all back so vividly. The other video is a rehearsal for Bach Christmas Oratorio.