One of those splendidly odd (and oddly instagrammable) concrete commie-era structures, the Hala Arena was actually inspired by the modernist Palazzetto dello Sport in Rome, which it resembles to a remarkable extent. Opened to the public in 1974, the sporting arena's best days may be behind it, but its 4200 seats and 13 500 square metres of usable space are still regularly used for concerts and sporting events. A modernisation of this venue is expected some time in 2023.