Aeronauts piloting an antigravity-powered craft descend through a Symmes Hole (John Cleves, Symmes) at the North Pole into the expected Hollow Earth. They contact several Lost Races, who pay them little heed. Progressing ever deeper, they learn that ...
If you like your hauntings with a heavy dose of philosophy thrown in, try the spooky but cerebral novella The Ghost of Guir House by American author Charles Willing Beale. A Mr. Henley receives an unusual request for assistance and decides on a whim ...