https://www.thenation.com/article/svalbard-arctic-open-borders/

When you land in Longyearbyen, the largest settlement in the Norwegian archipelago of Svalbard, you can step off the plane and just walk away. There’s no passport control, no armed guard retracing your steps, no biometric machine scanning your fingers. Svalbard is as close as you can get to a place with open borders: As long as you can support yourself, you can live there visa-free.