Little did I know that as I walked on the wall, beneath me at the Baluardo San Martino was a wonderful area of brick arches from yesteryear. I really just stumbled upon the entrance.
But what a delight - the subterranean cool air was a nice respite from the hot sun on this day.
Imagine the science hundreds of years ago to build such a place - no strong heavy beams to cross a wide span, only the beauty and grace of multiple brick arches.
Another hidden surprise in the magical city of Lucca.