The Telectroscope--an 11.2-meter-(37 feet) long by 3.3-meter-(11 feet) telescope-like device--was recently installed in London and New York and allows viewers to look at what people half a world away are up to in real time.
The device was designed in the Victorian age by Alexander Stanhope St. George, but wasn't built until this week. It relies on a tunnel that runs between the continents and a perfectly placed series of mirrors and lenses allowing you to see real time reflections from across the world. Also, you can see through people's clothes!
Okay, the above facts aren't true. The trans-Atlantic tunnel is really a broadband connection with HD cameras, and you can't see through anyone's clothes. Still, cool project, eh?