It's on Ascension Island, which is a Holocene stratovolcano (try saying that three times fast when you're pissed). Here's a map of the island's location in the South Atlantic. Here's a lovely piccie of the bamboo thickets on Green Mountain summit mentioned in the article. Nice, eh? A few more pictures here which perhaps serve to illustrate the barrenness of the place when it was visited by Charles Darwin. Now off you go and rethink conventional ecological theory. I can't, the God ate my homework.
Man-made rainforest baffles scientists - A cloud forest biotope started by 19th Century dudes that should have taken thousands of years to reach its current state (according to accepted theory) now boggles the brains of eggheads because it only took 150 years.