Flood basalt, formed from ancient volcanic eruptions, has been used for centuries to create striking outdoor sculptures. These massive works of art highlight the raw beauty and durability of volcanic rock. Among the most famous is the "Giant's Causeway" in Northern Ireland, though not a sculpture, its hexagonal basalt columns inspire many artists. Another notable example is the "Basalt Organ" in Iceland, a man-made structure mimicking natural formations. In the U.S., the "Stone River" installation at Stanford University features stacked basalt columns, while Japan's "Tsurumi Island Basalt Park" showcases abstract sculptures carved from volcanic stone. These pieces blend geology and artistry, offering awe-inspiring glimpses into Earth's fiery past.