This is a picture of a pear tree in my neighborhood. It lives in front of an apartment building not too far from mine and it is covered in fruit. I don't know why, but I find fruit trees fascinating. I've also heard that they offer the best bang for your buck as far as backyard gardening is concerned.
I grew up around mango trees and avocado trees and I love those too, but there is something about seeing a fruit you only know from the grocery store shelves out in the wild, even if that wilderness is just suburbia.
For an extreme take on neighborhood and city dining, check out this website on foraging (i.e. finding your food in an urban jungle). People actually do this!