Stunningly beautiful natural stone arches that have been lost forever after collapsing into the sea from natural erosion within these last few years. The first image on the left is Darwin's Arch in Darwin Island, in the Galápagos Archipelago in the Pacific Ocean. This arch collapsed into the sea on 17 May 2021. The second image is the Azure Window (known as 'it-Tieqa tad-Dwejra' in the vernacular), a natural stone arch formation that was near Dwejra Beach, in the island of Gozo. The Azure Window collapsed into the sea on March 2017.