Rome

I found some photos of the drain holes! They don't seem to be directly under the oculus (it's a big circle of dark reddish/purple-ish marble), but in the squares leading down the sloping floor. Four little holes per big square of floor is not much!

As a modern westerner, I expected a manhole sized drain grate, minimum.

Crazy-busy shopping day at the Piazza di Spagna. Shops would only let a few people in at a time, and people would line up outside each door, waiting to be let in to fondle the merchandise:

http://farm3.static.flickr.com/2733/4260308433_e326fca1df.jpg

Or, they'd just hang out on the steps, eating roasted chestnuts:

http://farm5.static.flickr.com/4019/4261058870_c75cf2b906.jpg

Here's the shopping street - people as far as you could see:

http://farm5.static.flickr.com/4006/4261064128_bcc2cbe19b.jpg