Building suggestions for Minecraft?

I wanted to build something in Minecraft again, but I have no idea… = (

It should go in the direction of modern / cyber technology / fancy, but still simple. So not just any known building from our world!

I appreciate every idea!

P.S: I want to build MAXIMUM 20-30 hours on it…

Build a modern house consisting of white concrete, dark gray concrete and spruce wood.

You could recreate the International Space Station (ISS) :-)

Build a map from CoD 1zu1 or something like that

Tip: build a white house 2 pockets modern, villa

A space station, a larger modern house, some system with redstone.