I'd love to have a fancy little remote control that can place me in any time period or universe (fictional or non-fictional) as well as make me invincible (so I don't get killed if I go to a war) or invisible, things like that. Mostly for going to places like the Minecraft world, Game of Thrones, things like that. Then I'd go to real places. Thermopylae, Stalingrad etc. etc.
I don't like telling people about that because they tend to think I'm insane.