We noticed this location in a completely unknown song from a rather obscure movie but any time we see such marvelous structures, we do our best to pursue and spot the location that has been used in the song. This is one such location. We quickly found out that the song was shot in Austria and from then on, it was a matter of spending some more time to arrive at the exact location.

About the location (from Wiki):
The St. Charles’s Church is a church situated on the south side of Karlsplatz, Vienna. It is located on the edge of the 1st district, 200 metres outside the Ringstraße. It is one of the most outstanding baroque church structures north of the Alps, and boasts a dome in the form of an elongated ellipsoid.

Ever since Karlsplatz was restored as an ensemble in the late 1980s, the Karlskirche has garnered fame due to its dome and its two flanking columns of bas-reliefs, as well as its role as an architectural counterweight to the buildings of the Musikverein and of the Vienna University of Technology. The church is cared for by a religious order and has long been the parish church as well as the seat of the Catholic student ministry of the Vienna University of Technology.

Movies shot at this location:
Mudhal Poo EdhuvO from Vedham (Tamil)
Kuch Kuch Khatti from Kuch Khatti Kuch Meethi
Mandara Buggaloki song from Daddy
AdugulOna song from Raghavendra