The Carboniferous period (359–299 million years ago) left behind remarkable basalt formations that have inspired stunning outdoor sculptures. Among the most famous is "The Giant's Causeway" basalt columns in Northern Ireland, though naturally formed, they've influenced countless artistic interpretations.

In Reykjavik, Iceland, the "Monument to the Unknown Bureaucrat" by Magnús Tómasson features a basalt pillar supporting a bronze figure, symbolizing nature's endurance. Portland's "Stone Field Sculpture" by Beverly Pepper arranges 42 basalt monoliths in dynamic patterns, echoing ancient geological processes.

Germany's "Basalt Stele" in Berlin's Tiergarten, created by Eduardo Chillida, showcases the material's textured beauty. Meanwhile, Japan's "Moai" replicas on Easter Island, carved from compressed volcanic ash resembling basalt, demonstrate global fascination with stone monuments.

These sculptures highlight basalt's durability and connection to Earth's deep history, making them powerful public art pieces that bridge geology and human creativity. Contemporary artists continue to explore Carboniferous basalt for its environmental resonance and primal aesthetic.