Secret Gardens

I've been spending a fair amount of time mulling over gardens and plants and things green and tranquil... which has led me down the path of finding all sorts of things I didn't know about.  What's heartbreaking is that they are all in cities where I was craving to find something like this... Oh well.

The Barbican Conservatory, London
Who knew this existed - how on earth did I miss it?
I found this photo by Pedro Silmon and more can be found on his website