Well it isn't central London where all the iconic ...

Well it isn't central London where all the iconic landmarks are, but it is where you can put most of them into a single picture. I said it was possible if only you can back up far enough, but I digress. It really is just a large green park accessible from central London by the Northern line via Edgewater, though you're in for a bit of a walk up a significant hill. The park is very nature-y, more than some of the others closer to the center. There are various swimming ponds. Parliament Hill is the spot you go for photos, some go to enjoy sunrise.