Fun fact: One of the most amazing facts of all time:

President John Quincy Adams approved a plan to send one-hundred men to the Arctic so they could burrow to the center of the Earth and meet the secret civilization of people who (allegedly) lived inside. Did we mention this plan also involved sleighs to be pulled by reindeer? It was proposed by an army officer named John Cleves Symmes Jr., who was convinced the Earth was hollow and wanted to establish trade with the races who inevitably resided inside its core. Quincy approved the plan, but Andrew Jackson assumed office before it took action. Not unreasonably, Jackson vetoed this state-funded journey to the center of the Earth.