One of the challenges in the 6th week of Fortnite Season 8 demands that you Visit the 5 Highest Elevations on the Island.
An overview of all Fortnite challenges of the 6th week can be found here.
Visit the 5 Highest Elevations on the Island
There are exactly 5 highest elevation signs that you need to visit around the map in order to complete this challenge.
When you visit one of the five highest elevations it will come up on the screen saying you have done so. Simply walk close to the height sign in in order for it to count.