20000 Leagues Under The Sea, by Jules Verne.
The story of Captain Nemo and his incredible underwater machine, the Nautilus. A submarine of considerable modern content (mysterious secret power plants, able to sustain underwater travel for extraordinarily long periods of time, complete living quarters, etc.), the Nautilus is Nemo's chief weapon in the war against Slave's plying the African nations for their trade.

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A Journey To The Center Of The Earth, by Jules Verne (1864)

Prof. Lindenbrook leads his intrepid party on an expedition to the centre of the earth, via a volcano in Iceland, encountering all manner of prehistoric monsters and life-threatening hazards on the way.