Happy Feast of the Dedication of the Basilica of St. John Lateran. Or, more precisely, the Archbasilica of the Most Holy Saviour and Sts. John the Baptist and the Evangelist at the Lateran.
As Cathedral for the diocese of Rome, the Lateran Basilica is the Mother Church of the world.
While I work on my posts about Rome, check out a beautiful virtual tour of the Lateran Basilica and its famous baptistery here: http://www.vatican.va/various/basiliche/san_giovanni/vr_tour/index-en.html You can even see the oldest obelisk in Rome — so old that Moses would have seen it. (In Egypt, of course. Not on the north side of the Lateran.)