First, however, you must find Tony Stark's lake house, as the lab is a secret part of this building.
Completing this challenge will earn you XP, which will help you unlock the Fortnite Season 4 Battle Pass skins.
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Tony Stark's secret lab location in Fornite at a glance
If you want to find Tony Stark's secret lab in Fortnite, you first need to find his lake house which is located on the border of G2 and G3 on the Fortnite map.
The Stark Industries location is the largest of the Marvel themed areas and sits on the former location of Frenzy Farm. Aside from the lake house, you can also find Stark Industries itself on this platform.
The easiest way to reach this area is to glide down immediately after jumping from the battle bus and explore freely before the storm starts closing in. There are also a number of zip lines dotted around the edge of the platform that will allow you to either ascend or descend from the platform.
Recent new quests include Touch a Cube, Spirit Vessel Caretaker's footprints, Command Signal, scroll locations, mini-pufts, seismographs, Ghostbusters signs and deploying a ghost trap for the Containment Specialist. Elsewhere in Season 8, you can start using Sideways weapons, partake in Sideways encounters, and find colour bottles for Tonna Fish.
How to find Tony Stark's hidden lake house laboratory in Fortnite
To find Tony Stark's hidden lake house laboratory in Fortnite, you must head to his lake house which is part of the Stark Industries location on the Fortnite map.
It's a good idea to visit the lake house at the beginning of the match, because it will allow you more room to escape the storm if needed and you can get straight back to the match once the challenge is completed. Just remember to keep an eye out for other players!
Once you've reached the lake house, head around to the right hand side of the building.
There you'll find a large bush, which you need to destroy using your harvesting tools.
This will reveal a passageway with a door at the end, which you can also destroy.
With these two obstacles out of your way, you can now enter Tony Stark's hidden lab and, in doing so, complete this challenge.
You can even get a sneaky look at the Iron Man suit when you visit the lab!