Gong, Concert hall in Vítkovice, Ostrava, Czech Republic

Gong is a concert hall and protected cultural monument in Vítkovice, a former industrial district of Ostrava, Czech Republic, housed inside a converted gas holder. The round steel structure has several floors, with a main performance hall, conference rooms, a gallery, and an information center at ground level.

The gas holder was built between 1922 and 1924 to store blast-furnace gas for the Vítkovice ironworks and served until 1998, surviving a wartime bomb that lay on its floor until 1970. Josef Pleskot's AP ATELIER converted it into the Gong aula in 2011–2012, and it opened to the public on 1 May 2012.

Since 2012 the complex has hosted the Colours of Ostrava international music festival, along with concerts, theatre performances, film screenings and exhibitions. It also houses the Ostrava City Gallery. The ground floor keeps the gas holder's original riveted steel plate as its walking surface.

The site sits within the Lower Vítkovice industrial complex, which is well signposted and has parking available on the grounds. The building is generally open only during events or guided tours, so checking what is scheduled before visiting is a good idea.

The gas holder's inner bell, 70 m across and 18.5 m tall, was lifted almost 15 m during the conversion and now carries a glazed 20.6 m drum on top that lights the hall from above. The shell keeps its original riveted plates, 10 to 32 mm thick, cleaned and painted metallic black.