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Aviation
Planes, helicopters, you name it. I like them all, and like to fly them in the simulator too (usually on VATSIM), most of the time without crashing...
Computers
They're everywhere nowadays, and absolutely amazing! In my free time I like to program them or play on them. You can check if one of mine is alive here🥧
Space
The stars, the galaxies, and everything else. All fascinating! Fotographing those objects is quite fun as well.
Rockets
Substance goes boom, and rocket goes up. Cool isn't it? That might be a little simplified, but still cool. They frequently take satellites, which are fun to receive as well (assuming the setup didn't fell appart again).
Engines
The pistons go up and down, and the vehicle goes forward or backwards. How can you not find that cool?