Though it has been a fairly popular idea in fiction, I think that there may be some "lost worlds" out there in the real world. A "lost world" is a remote place where dinosaurs and other such creatures thought long vanished from the earth still roam, and even thrive. There could be some remnant dinosaurs around even after their general extinction some time after Noah's Flood. As I have posted in a different thread, I believe the Crosswicks Monster to be an example of a dinosaur that managed to survive into recorded history.
The Congo or the Amazon are two obvious general regions where places like this could still exist, due to the ability of those places to support megafauna and their reputation of being incredibly difficult to explore to this day. But, I have also run into stories that allege there was a tropical valley in some mountain range within in the far reaches of the West Coast of North America that contained strange wildlife, with one possible site being the Mackenzie Mountains. For those interested, I made a post
here on the subject and will provide an additional website link
here.
It also seems possible to me, as odd as it sounds, that a "lost world" could exist under the continent of Antarctica if there is some kind of lighting source, considering that temperatures underneath that all ice can actually get
quite warm. That also coincides with my idea that there are likely Antediluvian ruins underneath and possibly on the Antarctic surface. Both ideas could be true, and they certainly seem to be more plausible than the idea that there's nothing more to that continent than ice and penguins, considering how much the powers that shouldn't be take interest in it. As I have said, I have also thought that perhaps some technology from these ruins will be excavated, and due to their highly advanced nature, will be played off as alien tech by the elites, when it was really human made all along.