This reminds me, I was thinking of making an exploration character to try to explore every nook and cranny in every zone. Street sweeping and zone badges being the only xp gain. Only use stuff in the zones to help, vendors, trainers, stores, etc.
I might just do it to do a solo game, now to think of an AT and powersets. No travel powers, just sprint or athletic run (jetpack for vertical exploration), don't want to miss anything. Take pictures 📷 write a journal of experiences.
I'd have to do it it in a grid fashion, no reveal power that way I know if I went everywhere.