This plaster cast of an ant colony was made by Walter Tschinkel, professor at Florida State University, who is studying ants’ architectural methods.
Scientists pumped 10 tons of concrete into the tunnels of this (thought to be) abandoned ant colony, creating the complicated structure you see in these images. Visit the source link to see the video of the process.
Ants aren’t the only insects that are master architects. Termites, though markedly different as they build above the ground instead of tunneling into it, are also creators of amazing structures. This image reminded me of ancient Buddhist temples.