I always feel like somebody's watching me

Smile. You're on surveillance camera
Smile. You're on surveillance camera. The average American is captured on camera 100 times a day.
MPR Photo / Nikki Tundel

You used to only be able to find surveillance cameras in banks, or 24-hour convenience stores or communist dictatorships.

But today they're virtually everywhere -- from buses in London to restaurants in New Delhi to the Bridges of Madison County in central Iowa.

Security technology expert Bruce Schneier joins reporter Nikki Tundel for a surveillance walking tour of downtown Minneapolis.