Hollow Earth
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The Hollow Earth is a concept proposing that the planet Earth is entirely hollow or contains a substantial interior space. Notably suggested by Edmond Halley in the late 17th century, the notion was disproven, first tentatively by Pierre Bouguer in 1740, then definitively by Charles Hutton in his Schiehallion experiment around 1774.
Chapel, bell tower and penitential beds on Station Island. The bell tower stands on a mound that is the site of a cave which, according to various myths, is an entrance to a place of purgatory inside the Earth. The cave has been closed since October 25, 1632.
Edmond Halley
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Edmond Halley was an English astronomer, mathematician and physicist. He was the second Astronomer Royal in Britain, succeeding John Flamsteed in 1720.
Portrait of Halley (c. 1690)
Portrait by Richard Phillips, before 1722
Site of Halley's Observatory on the island of Saint Helena
First page to volume I of Miscellanea curiosa published by the Royal Society (1705), in which Halley wrote "An estimate of the quantity of vapours raised out of the sea, derived from experiment"