Hikers on rim of old crater, Avacha volcano, Kamchatka, East Siberia, Russia

Blue wildebeest (brindled gnu) (Connochaetes taurinus) cow and days-old calf running, Ngorongoro Crater, Tanzania, East Africa, Africa

Looking across the old crater towards the smoking 2438m summit of the active volcano Mount Canison, Visayan island of Negros, Philippines, Southeast Asia, Asia

Tiwu Ata Mbupu (Lake of Old People) one of three crater lakes on the summit of Mount Kelimutu on Flores island, Indonesia.

The 13.7-day-old Moon (a day before Full) with the south polar region tipped toward us in a favourable libration for viewing the southern regions and features. This was April 6, 2020. The large crater, Bailly, is on the southern limb, better seen here than at most similar phases, due to the favourable southern libration.

The 13.7-day-old Moon (a day before Full) with the south polar region tipped toward us in a favourable libration for viewing the southern regions and features. This was April 6, 2020. The large crater, Bailly, is on the southern limb, better seen here than at most similar phases, due to the favourable southern libration.

Old belfry wiith view of blue sea, Ia, Oia, Santorini, Greece, Europe

Old belfry wiith view of sea and caldera houses, Ia, Oia, Santorini, Greece, Europe

Young woman hiking, backpacking, hiker with backpack, snow field, descending towards summit of historic Chilkoot Trail, Chilkoot Pass, Crater Lake behind, alpine tundra, Yukon Territory, British Columbia, B. C., Canada

Young woman jumping across a creek, hiking, backpacking, hiker with backpack, historic Chilkoot Trail, Chilkoot Pass, near Crater Lake, alpine tundra, Yukon Territory, British Columbia, B. C., Canada

Firehole River in Yellowstone. Waterfalls of hot water.

Milky Way and old tree at night, Crater Lake National Park