Rock Imperium returns to Cartagena, Spain from July 3-5, 2026, bringing together an impressive lineup of metal and rock acts for three days of heavy music. The festival features legendary headliners Iron Maiden, Within Temptation, Mastodon, and Sabaton, alongside notable acts including Anthrax, Testament, Trivium, and Lacuna Coil. With 25 artists spanning metal, rock, goth, and alternative metal genres, the lineup includes performers from Spain, Netherlands, United States, Italy, United Kingdom, Sweden, and Argentina. This metal festival showcases both established legends and emerging talent across the heavy music spectrum.