If you're heading to London this fall, here's the latest reason among many century-old ones to visit Kew Gardens. A few months ago, this Royal Botanic Garden jewel opened its Rhizotron & Xtrata Treetop Walkway, and I'm guessing the experience — unlike its sadly dysfunctional web page, which promises but doesn't deliver — could knock your socks off.
After looking through a few dozen online sites trying to get a real sense of the experience, I recommend the Flickr slide show posted by a bloke named Andy Brown.
photo credit: JL2003
Not to worry if you can't manage the 108 steps to the top; there's a lift. For the insatiably curious, here's more reading.