In Whittier, Alaska, nearly all of the inhabitants — around 200 of them — live in the same building. The high-rise has 14 floors.

While the town was being built, it served as a residential community for soldiers. Today, it has its own ZIP code, church, playground, clinic, store, and police station. The only way to reach the town is by water or a 2.5 miles long tunnel whose gates are opened and closed every half an hour. At night, the tunnel stays closed. During the summer, Whittier has 22 hours of daylight, while the winter snow piles up around 19 feet.