Once augmented reality apps become more common I can imagine this becoming more popular. If you are a tourist and want to find stuff, or just see the ads you would be able to load up the ads layer and maybe even get discounts for your trouble.

If you want to just see the architectural facades as they were meant to be seen, then no tech required. I would love to see Vegas or New York, for instance, with the ads scrubbed and then be able to pull up dynamic ads with a phone or heads up display.