PORTLAND, Ore. (KOIN) — The pair of massive sinkholes that continue to swallow up the popular lookout at Cape Kiwanda State Natural Area may one day form a new sea stack, a report recently completed ...

Natural erosion finally took its toll on Darwin's Arch, a famous rock formation off the coast of the remote Galápagos Islands, forcing the top of the archway to collapse into the Pacific Ocean on ...

Photo of the now-collapsed sea arch along the trail to Shovel Point at Tettegouche State Park. (Minnesota Department of Natural Resources) An iconic sea stack that was adored by generations of ...