In 2009, I read an article in Wired magazine about Patrick Blanc's "Living Wall" at the Athenaeum Hotel in London.
He created a vertical garden on the exterior of a building and I wanted to see it! The plants on the wall thrive on a network of slats, artificial felt and an automated water/fertilizer system. You can read all about how he does it here.
But as you know, London is enormous and although I carried the article with me on my trip, I thought the chances were slim that I would be able to find/visit it during my short stay in London.
The day we arrived, as we rode from the airport to our hotel in a taxi cab, my ever-calm husband casually pointed out the window and said "I think that's the hotel you wanted to see."
All I can say is that I practically gave the taxi driver a heart attack with my exclamation. He quickly realized that all was well and that I had simply "found something" that I was looking for.
There it was! We had found it by accident! The next day we made sure to walk by The Athenaeum on our way back from dinner so that I could photograph it properly.