The building was erected to thank God for saving the life of Kaiser Franz Josef, then aged 23, who was stabbed in the neck by a would-be assassin; fortunately the wound was relatively slight due to the sharp reflexes of the monarch's companion.
The photo was taken from Sigmund Freud Park which is opposite the main entrance. Freud's old surgery, now a museum, is only a couple of blocks away and the good doctor would have passed the twin spires on his daily amble to his favourite coffee house.
I've been inside this imposing edifice on a couple of occasions; first time it was to listen to a concert of gospel music, and the second time it was to visit an exhibition of contemporary art.
The church was in the news a year or two ago when a group of asylum seekers occupied the building for several weeks as a protest against overcrowding at an asylum centre in the province of Lower Austria. The protest gained much media attention.
The advert you can see on the hoarding is for a popular brand of milk chocolate from Switzerland.
This post linked to Inspired Sundays