Impressive demos of HTML5-based wizardry may be more common than ever now, but that doesn't mean there isn't still room to be impressed. One of latest to raise the bar is the One Millionth Tower documentary from the National Film Board of Canada's Highrise project. The main feature itself runs just over six minutes if you choose to simply sit back and watch, but things get quite a bit more interesting if you dive in and explore the highrise neighborhood that's the focus of the documentary, which is realized in WebGL-based 3D environment. Naturally, there's also a behind-the-scenes look at how the documentary was made, and the NFB has even made the source code available for those that want to dig deeper. Head on past the break for the trailer, and hit the source link below to check out the full thing for yourself -- we'd recommend switching your browser to full screen mode for the best experience.