Navassa Island, Caribbean
The sovereignty of the uninhabited island of Navassa is disputed by both the United States and Haiti. Anyone who wishes to visit is required to receive a special permission, and such permits are only sometimes distributed. In any case, the island is home to a wide variety of endangered animal species, all of which have unquestionably benefitted from the relative absence of human visitors.

Navassa Island Caribbean
Coca Cola Vault
You are not seeing things; the words “Coca-Cola Vault” are clearly visible there. What exactly is it about Coca-Cola that makes it one of the most off-limits locations on the planet? To put it simply, it’s all about the formula. At the Atlanta museum owned by Coca-Cola, the actual, handwritten original recipe and formula for Coca-Cola may be found locked away in a vault that costs several million dollars. The public is allowed to get a glimpse of the vault from the outside, but they are not permitted to go inside.

Coca Cola Vault