I used the assets from the "Abandoned Manor" package that I found on the Unreal Engine Marketplace. It's a pretty cool package if you want to explore the post apocalyptic scenario! You can find it here : https://www.unrealengine.com/marketplace/en-US/slug/abandoned-manor .
I added some elements (the spider webs and all the vegetation), did the lighting and set dressing based on a bunch of concepts and maps from Uncharted 4 - A Thief's End. I also wanted to thank Maxime Galland and Thomas Lemaille for their advices and feedbacks! It really helped me to understand my mistakes and learn from them!
So here it is, hope you enjoy!
Abandoned Mansion