How long will it take to go around the star?
Description from Daily Overview
The town of Palmanova, Italy, is recognized by its concentric layout known as a “star fort.” The rationale for this construction was that an attack on any individual wall could be defended from the two adjacent star points by shooting the enemy from behind. The three rings that surround Palmanova were completed in 1593, 1690, and 1813.
Video Answer
Daily Overview / Satellite imagery courtesy of Digital Globe / Benjamin Grant
When Math Happens 