"The Mosque" (as it's known) in Zagreb

"The Mosque" (as it's known) in Zagreb. Actually it's this, the Croatian Association of Artists, but colloquially known as "The Mosque" because the building, by Mestrovic, was used as a mosque for about five years. Since 1990 it's been used as an Art Gallery. It's striking both by day and by night, when the space inside the pillars is lit with different colours. See here.