Needing to get away from the computer last week, I visited the Römisch-Germanisch Museum in Cologne to see the current exhibit, The Return of the Gods, premiering marble sculptures and ancient paintings on loan from the Pergamon Museum and the Collection of Antiquities (through end of August, 2012), featuring such reliefs as Neptune from Greek times.
I then revisited the rest of the museum which contains the (in-situ) Dionysus mosaic (at right).
The museum is a must-see for all tourists visiting Cologne. That means the locals (like me) often don't go. I frequent the Praetorium often, but hadn't been to the RMG in years.
The best part was browsing the Museum Shop afterwards. It contains an impressive collection of historical books about the Greeks, the Romans, of course, and, to my surprise, some excellent books on the Celts and the Germanic tribes. I bought three, all in German (sorry for those not fluent in German).
Die Kelten by Martin Kuckenburg (ISBN 978-3-8062-2274-6), a nearly-coffee table size book with gorgeous color pictures and adequate coverage of the Continental Celts.
Die Germanen, by Bruno Bleckmann (ISBN 978-3-40658476-3), B&W pictures and much text. I'm looking forward to dipping into this one
Auf Römerwegen durch die Eifel, Thomas Schiffer (ISBN 978-3-93972247-2), a bargain buy, contains a compilation of the traces of Roman presence from Cologne through the Eifel region of Germany. This will be useful for side trips, especially when on the way to somewhere else.