epa13181905 A person rides a hydrofoil surfboard on the Main River at sunset in Frankfurt am Main, Germany, 20 August 2026. EPA/MATIAS BASUALDO

epa13181904 People gather on the Main River during the European Open Air concert in Frankfurt am Main, Germany, 20 August 2026. The annual event brings spectators to the riverbanks and onto the water for open-air orchestral music performances. EPA/MATIAS BASUALDO

epa13181903 People gather on the Main River during the European Open Air concert in Frankfurt am Main, Germany, 20 August 2026. The annual event brings spectators to the riverbanks and onto the water for open-air orchestral music performances. EPA/MATIAS BASUALDO

epa13181902 People gather on the Main River during the European Open Air concert in Frankfurt am Main, Germany, 20 August 2026. The annual event brings spectators to the riverbanks and onto the water for open-air orchestral music performances. EPA/MATIAS BASUALDO

epa13181901 People gather on the Main River during the European Open Air concert in Frankfurt am Main, Germany, 20 August 2026. The annual event brings spectators to the riverbanks and onto the water for open-air orchestral music performances. EPA/MATIAS BASUALDO