Gravestones and cemetery
Well, I know some candidates are technicly allowed, but it feels weird to accept ANY CANDIDATE on a cemetery or graveyard. Thatswhy I reject them all.
Imagine just losing someone you loved and you are moarning there and some Ingress players are farming (Or PoGo players taking down a raid). Some players can get load and all. I think this would be really, really frustrating.
I really really think there should be a rule against portal candidates on graveyards. I won't accept them, I just can't!