Believe it or not, there are many locations around the world which are rumored to lead to hidden subterranean realms. This idea is what is referred to as Hollow Earth Theory. Hollow Earth Theory is the theory that the earth is either entirely hollow or is honeycombed with an elaborate network of caverns and tunnels which house civilizations or alternate realms. Mt. Shasta in Northern California is rumored to lead to a subterranean civilization of Lemurians. Blowing Cave near Cashman, Arkansas is also rumored to lead to gloomy subterranean caverns filled with giant serpents, giant hairy humanoids, giant insects, and even an advanced ancient nonhuman civilization. The hypogeum of hal-saflieni on the island of Malta is rumored to have once led to similar places with legends of people encountering bizarre beings and even a story of a group of children, school teacher, and guide going missing after a passage under the island collapsed trapping them. For weeks afterwards it was rumored that people on the island heard mysterious screams coming from within the island. Archeletta mesa north of Dulce, New Mexico is also rumored to be the site of a subterranean alien/government base where horrific animal/human/alien DNA experiments are carried out along with other supernatural experiments. I could keep going on forever listing locations that these subterranean worlds are rumored to exist, but you get the point. The truth is, we know very little about the planet's interior. But it is just a theory that these places exist, nothing has ever been proven and the scientific community today consider this notion to be pseudoscientific and conspiracy theories. But it'd be pretty cool to have a real "Journey to the Center of the Earth" adventure.
