Start Fortnite in 'Creative' mode

Select 'Discovery' then 'Island Code'

Type in (or copy/paste) the map code you want to load up.

You can copy the map code for C̸r̸i̸m̴s̷o̸n̸ ̸c̸i̷t̸y̵ by clicking here: 9138-7635-2210