And, of course, they didn't know what was there.
In the early 1800s Captain Symmes of Cincinnati seriously put forward the theory that there was a passageway at both poles that lead under the earth's crust to onion layers of different worlds where other beings lived.... weird!
The hundred or so years of speculation all contributed to a sense of sublime awfulness - which fed into a love of gothic horror - which fascinated both the explorers and the public that read about their efforts.
I'll be better next week!
If you want to volunteer at the urban farm come along on Tuesdays after 10.00 for a chat or contact Dave at : firstname.lastname@example.org