If you've just gotten the Don a Disguise Quick Challenge in Fortnite Chapter 2 Season 4 then you might be a bit confused on how to complete it. There's not a whole lot in the way of phone booths around to enter to change your look. However, there is one particular place you can go that will allow you to finish this challenge and get some easy XP towards your Battle Pass.
From what I can tell, if you're looking to Don a Disguise right now there's only really one place you can go. That location is Doom's Domain, which seems to be the only spot you can find yourself a telephone booth.
Doom's Domain can be found where Pleasant Park used to be located. It's really the only place currently that features Henchmen other than the jets that land around the map. I'm sure this will change in the future when new POIs are added, but in the early stages of the season they are hard to find.
There appears to be three different phone booths you can access. Two are near the roads that enter into the area, and one can be found in the center of Doom's Domain and right next to the big Doctor Doom statue! Be careful for Henchmen and even Doctor Doom himself!