Kew Gardens, at Kew Palace in southwest London, is the largest and most diverse collection of living plants in the world. It was pretty remarkable. We went there on a Saturday morning, with a picnic lunch. The weather wasn't terrible but the clouds and sky changed so much throughout the day that it was driving me crazy trying to get the lighting right in the photos.
The area is massive, and we didn't see it all, but we did see a lot of it, and it was all beautiful. I'll let the pictures speak for themselves.