Klippenschlösser und Höhlenwohnungen Europas von S. Baring-Gould Taschenbuch
41,51 €
This book was written in 1911. People would find their well water going bad, go down to explore, and find the way into vast underground catacombs. The cave plans in the book are indistinguishable from those found in D&D modules, and the illustrations look like scenes from Skyrim.
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