1. On April 22, 1916, the Katmai National Park and Preserve was established in Alaska. It is home to the Valley of Ten Thousand Smokes, a volcanic ash-filled valley created by the eruption of Novarupta in 1912. The park is known for its abundant wildlife, including brown bears and salmon.

2. In 1970, the first Earth Day was celebrated on April 22. This day is now recognized globally as a day of environmental awareness and activism. Alaska, with its vast wilderness and diverse ecosystems, has long been a focal point of environmental concerns.

3. On April 22, 1992, the Alaska Native Heritage Center opened in Anchorage, Alaska. The center is dedicated to preserving and sharing the cultures and traditions of Alaska's indigenous peoples, including the Inupiat, Yup'ik, Aleut, Alutiiq, Tlingit, Haida, and Tsimshian.

4. In 2008, on April 22, Mount Redoubt erupted, sending a plume of ash 50,000 feet into the air. The eruption forced the closure of Anchorage International Airport and disrupted air travel throughout the region for several days.

5. On April 22, 2015, a massive landslide occurred in Sitka, Alaska, destroying multiple homes and claiming the lives of three people. The landslide was triggered by heavy rains and soil saturation, a common occurrence in the rainy climate of Southeast Alaska.