
It's truly amazing!
The two islands—Big Diomede (Tomorrow Island, Russia) and Little Diomede (Yesterday Island, USA)—are only about three miles (4.8 km) apart but lie on opposite sides of the International Date Line. Because of this, there is a 21-hour time difference between them, meaning they are almost a full day apart!
You can see one island from the other, and in winter, when the sea freezes, you could even walk across the ice—from today to yesterday or vice versa! Standing on one island, you are literally looking at yesterday or tomorrow, just a few miles away.