A Journey To The Center Of The Earth, by Jules Verne.
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.
20000 Leagues Under The Sea, by Jules Verne.
The story of Captain Nemo and his incredible underwater machine, the Nautilus. The Nautilus is Nemo's chief weapon in the war against Slave's plying the African nations for their trade.