Hiroya Minakuchi / Arch-beaked Whale (Mesoplodon carlhubbsi) skull

Jeff Foott / DJuniper (Juniperus sp) dead tree and Delicate Arch, Arches National Park, Utah

Jeff Foott / Full moon over the North Window arch, Arches National Park, Utah

Hiroya Minakuchi / Sandstone arch at night, Arches National Park, Utah

Shane P. White / Heaven's Gate, highest and tallest rock arch in world, China

Tim Fitzharris / Turret Arch at night with Milky Way, Arches National Park, Utah