«Post hec paucis passuum milibus, portus et ipse manufactus, Pisanum vocant, aderit et fere contiguum Liburnum, ubi prevalida turris est, cuius in vertice pernox flamma navigantibus tuti litoris signum prebet» | (After a few miles there is the man-made harbor called Pisan port, close and almost adjoining Livorno, where a very strong tower arise, from whose top every night the flame shows the sailors the safe shore) |
He was describing our lighthouse.
See also: The Lighthouse - The Caged Lighthouse - On Top of the Lighthouse - The Fresnel Lens
External links: Petrarch - Lighthouse (Wikipedia)