I know I said that Humayun's Tomb is perhaps my favourite site so far in Delhi but - that's not quite true. I also really really like The Baha'i House of Worship. Commonly called the Lotus Temple, because of it's shape (check out the 27 marble clad "petals"), is open (and free) to all - regardless of your faith. The interior is beautifully and minimally decorated (sorry, not allowed to take pictures inside) and you are encouraged to sit inside and pray (silently) for as long as you want. When I went inside I found it to be incredibly.....relaxing. It was encouraging to see visitors (foreigners and non-foreigners alike) of different religions sitting respectfully among each other either enjoying the calming silent atmosphere or with their eyes closed (or head bowed) in silent prayer. A nice reminder that we can all live together regardless of what we believe.
The exterior of the building itself (along with the surrounding pools and well manicured lawns)....well it speaks for itself, no? Gorgeous.
Designed by architect Fariborz Sahba - since it's completion in 1986 the Lotus Temple has become one of the most visited buildings in the world and has also won numerous design awards. I'd definitely recommend visiting it if you visit Delhi. I found it particularly beautiful to photograph just before sunset (and of course I don't have those pics with me right now to include in this post lol).