Circus Maximus, Rome
How about running in an old and very historic scenary?
Then you might want to try the famous Circo Massimo which nowadays is just a pale memory if its once so glorious days.
It's only here that I mention this oval and not in the tourist traps for I believe it deserves better.
In Rome there are so many sites that could use some brushing up, but of course there are simply too many of them...
Equipment: Good sneakers and lots of bottled water!
The circus maximus is used by many people as a place for jogging, and not without reason. The place is huge and you can run here for a long time, even if you only go round one time.
Equipment: Make sure to use good running shoes and wear socks. The place is very dusty so sand gets into your shoes very easily.