To complete this challenge in the Fortnite Season X mission 'Worlds Collide', it's necessary to visit a Rift Zone and search chests. The question is, where do you find them?
At the time of writing, there are only two Rift Zones on the map, but others will likely appear during the remainder of Season X.
The first is in Tilted Town, a city that emerged from the past and replaced Neo Tilted. Buildings are prohibited, and all characters entering one are transported to the Wild West era.
The second is in Retail Row. Since the installation of the Rift, Mega Mall has disappeared and the city has regained the appearance it had during the early seasons of Fortnite. Also, Fiends have invaded the place, because why not?
It is super simple to locate the Rift Zones from the Battle Bus — they are covered by gigantic blue bubbles.
Note: Loot Lake may also be a Rift Zone due to its altered gravity, but this theory has not yet been confirmed.