The Arctic comes to you
This is the southernmost drift ice in the northern hemisphere: sea ice born in Siberian river mouths, carried a thousand kilometers by wind and current, arriving at a UNESCO World Heritage peninsula where brown bears outnumber roads. The ice carries its own ecosystem: sea angels drift under the floes, and Steller's sea eagles ride in on top of them.
We chose it because nothing else on this list appears and disappears every year. The window is a few weeks long. The arrival date is never guaranteed. You don't visit the drift ice so much as intercept it.