In Zagreb's main square, buildings covered in lettering and adverts.
I'm not lovin' it: small demo against McDonalds.
Glagolitic text in the cathedral, which unlike some in North-Western Europe has the feeling of a living, working religious building. The script was devised by St Cyril in the C9th from Greek forms, and is the foreunner of Cyrillic (history of the Glagolitic script, and an explanation).
Miracle wall at Kamenita Vrata: in 1731, a fire burnt everything in the area around this gate into the walled town of Gradec. except a painting of the Virgin. The people put signs up thanking the Madonna for the miracle, and people pray there today.
Tiled roof on St Mark's Church (C13th, roof added in 1880), in the Trg Svetog Marka. Depicts the coats of arms of the Kingdom of Croatia, Dalmatia and Slavonia (L) and of Zagreb (R), and looks like Lego.
Green netting over blue scaffolding in the Upper Town. (Across the Adriatic in Northern Italy, they tend to use black scaffold with gold fitments.)
Suspended airplane at Ljubljana airport, Slovenia.