I'm not a big goer-into-churches or mosques or temples unless they are truly extraordinary. Religious art is the most limited art form, IMHO, and gets boring pretty quickly. I usually want to see something really unusual. Lviv actually has some pretty nice churches -- Catholic, Armenian and Orthodox, all in a very compact area.
This is the dome of the Boyim Chapel, the tomb belonging to a Hungarian noble family. Each of the 36 sconces holds a Catholic saint. This chapel is most noted for the seated Jesus on its roof, a skull at his feet. I didn't get a photo though.