Sun's out, buttresses out

As Catedrais is one of the most beautiful and mysterious beaches in northern Spain. It's on the famous Camino de Santiago pilgrimage route and its official name is Aguas Santas (Holy Waters) beach. It's also known as As Catedrais because its arches, thought to have been carved by the action of salty water and wind over millions of years, look like the buttresses of a Catholic church. However, some geologists have argued that these arches and caves are not entirely natural but are the remains of an ancient Roman gold mine, and believe certain formations suggest they were created by humans rather than nature.