The Romans built an aqueduct under the city of Naples back in their day. It's been used on and off since then. We toured part of it. The main use of it lately was as a bomb shelter in WWII.
We had a very nice lunch on our last day in Colorado, with our friend Erin and with Florine and Saint. The place was a bit weird and historical - something about it having been donated by Uzbekistan to Boulder. Food was very good, too.