Snake Island

Snake Island
Also known as Ilha da Queimada Grande, Snake Island is an island off the coast of Brazil in the Atlantic Ocean. The name suggests that it is full of snakes and yes a serious amount of snakes. It is believed that there are between one and five snakes per square meter, with an estimation of 2,000 and 4,000 snakes overall. These snakes aren’t the most friendly type either, the island is home to the bothrops insularis, a very poisonous viper. Theoretically, with authorization from the Brazilian Navy, it is manageable to enter the island legally – but then again why would you want to do that?
Svalbard Global Seed Vault

Svalbard Global Seed Vault
Let’s look at disaster prevention at its finest, almost a century later Norway has a more realistic method to prepare for the worst. Svalbard Global Seed Vault opened during 2008 and is home to 983,524 seed samples. And in 2018 which was also known as the Doomsday Vault, the objective of it was a stock of seeds and plant samples should a total disaster happen, civilization will not face full extinction. Located on an island above the Arctic Circle between Norway and the North Pole, it is not accessible by plane, you will only get you as far as Svalbard. Also, due to its nature, it is out of bounds to all visitors. Regardless if you actually did make it that far, you probably wouldn’t be able to get in.