Antelope Canyon on the Navajo Nation, east of Page, Arizona, United States (© Mark Skalny/Getty Images)

International Rock Day, observed on 13 July, celebrates the geological building blocks beneath our feet and encourages curiosity about how rocks shape Earth's landscapes and history. From the dramatic cliffs of Britain's coastline to vast desert canyons abroad, rocks reveal stories of ancient seas, shifting continents and life over millions of years.