“Where are the Eyes is a program for detecting and mapping surveillance cameras. Users mark cameras on their phone as they walk past them, and build a shared global map of surveillance.
Our hope is that Where are the Eyes will be widely adopted and used to help activists in two ways: to increase awareness of surveillance and authoritarian practices, and to plan activist movements.”
Something to keep in mind in case you have to go anywhere. Currently over 2k users, works on Fdroid.