The Gasometer is a 1912 gas-holder on the eastern edge of the city, converted into an exhibition space for the monumental 360° panoramas of the artist Yadegar Asisi. The displays rotate every couple of years — past shows have included Rome 312, the Great Barrier Reef, the Amazon rainforest, and a panorama of bombed-out Pforzheim itself.
A viewing platform inside the cylinder gives different perspectives at different heights. Entry around €13. Allow 60–90 minutes. Probably the most striking single thing to do in the city outside the Schmuckmuseum.