The Marianas Trench, Pacific Ocean
Unlike the rest of the list, this one isn’t off limits. It’s just really tricky to get to. It’s the deepest place in the ocean and only four people have ever made it to the bottom. If you happen to gain access to James Cameron’s submarine, you could check out the weird scaleless fish and giant amoebas in person. I’ll hedge my bets and say you can’t, so this counts for the list.