Google Map's STREET VIEW.
This is sooooooooo fucking insane and 1984-esque, but who cares...it's exactly what I envisioned the future bringing us! If I can't have hover boards, I'll take the ability to look 360 degrees down the streets of major cities!
Just click on that link, find the lil' guy there on the Las Vegas strip and move up and down the street turning the view with your mouse. There's five different cities at the moment, and more to come, I'm sure!