Trinity College in Dublin, Ireland, home of the famous Book of Kells, Ireland's most precious medieval artifact. Book of Kells is a stunning manuscript containing the Four Gospels. It is a beautiful campus.
The Four Bridges of Florence. Ponte Vecchio, Ponte Santa Trinita and Ponte alle Grazie are the best of 4 bridges in Florence. The most popular of these are Ponte Vecchio in Siena and Ponte alla Carraia in Lucca.