A really old book. But the story was on Mars. ‘The Atom car…’ An antient Martian city was found underground and the hero had to fight a monster guarding a Martian princess.
Anton
Theres a long running battle through underground ruins with the goal being a heroine trapped in a rotating underground prison. Each cell is utterly inaccessible except for one day a year.
I don't recall any atomic "car"; but there are dirigibles and IIRC some sort of moving land-based fortress which are powered by vaguely mysterious forces.
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