For SV folks who want to see a (not operational) Fresnel lens, there is one nearby at https://en.m.wikipedia.org/wiki/Pigeon_Point_Lighthouse
Alcatraz and the Faralones are technically within SF city limits.
http://www.terragalleria.com/images/us-ca/usca30023.jpeg
https://californiathroughmylens.com/wp-content/uploads/2018/...
https://www.nps.gov/safr/planyourvisit/the-visitor-center.ht...
https://www.nps.gov/safr/planyourvisit/images/lgthouselenscm...