A medieval-style castle with a giant alert icon emblazoned on the walls, warning of an impending siege or attack, with knights and soldiers rushing to defend the fortress.

A futuristic spaceship cockpit with a large alert icon on the control panel, flashing bright red and accompanied by a loud alarm sound, indicating a critical system failure.

A futuristic cityscape with a giant alert icon hovering above the skyscrapers, warning of an impending disaster, with flashing red lights and a loud siren in the background.