This is a paid asset, but now you can download Ancients Free.
Detail this asset from Unity Store: Original Link
Ancients
Create the weathered temples of South America and Asia’s past or branch outside our planet and construct mystifying alien lands with the numerous temple facades, structures, dwellings, archs, pillars and much more. Whether you want Mayan civilization or sci-fi alien worlds, this kit’s cracked stone and patina-covered pieces will make your imaginative world seem real!
Designed by Sebastian Luca, modeled and textured by Jakub Vondra, with cover art by Maxx Burman.
Please note: Proceed with creativity! You are about to purchase a 3D asset kit that includes elements to set the scene as you build your world, whether it’s for video games, film, television, design, or art. These completely customizable assets will serve as the building blocks to help you create an original environment with Unreal, Unity, Houdini, Blender, Maya, Cinema 4D, and 3ds Max native file support. With a license you can download this kit in multiple file formats, all you need to do is create a free account. Inside this kit you will find: