The frontier in my vision is caves. I love exploring caves and going on tours, but there are some caves that we don´t know exist today. I don´t think caves get explored as much as like the ocean, that covers over 71% of earth. People used to dig and mine in mines and caves to find oil or gold, and not a lot of people still find that interesting. There are a lot of fossils or artifacts still not found today. Frontiers are amazing places to search for anything about our past.
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