Édouard Riou's Lost World: Explorers at Prehistoric Inland Sea, Jules Verne 1864

A lone figure raises an axe in triumph — or warning — at the edge of a vast subterranean sea, while mounted companions watch from rocky shores. Towering needle-like rock formations pierce a stormy underground sky, dwarfing the explorers and underscoring their terrible insignificance. This is the hollow Earth at its most sublime and threatening, a primordial landscape where prehistoric geology looms with cathedral grandeur and every shadow suggests monstrous life just beyond sight.