Concha acústica de Londrina, Open-air amphitheater in central Londrina, Brazil.

The Concha Acústica de Londrina is a shell-shaped amphitheater made of concrete with semicircular tiers that naturally amplify sound for performances. Its architectural design uses the geometry of the form to distribute acoustics throughout the space.

The amphitheater opened in 1957 after a mayor encountered a similar design in another region of Brazil and brought the concept to Londrina. This marked the beginning of its role as a city venue.

The name refers to the concrete shell that projects sound toward rows of concrete seats. In the 1960s the space hosted weekend footing promenades, artistic presentations and political rallies, and it still stages popular gatherings. A bronze plaque placed at the 1957 opening, honouring Londrina's workers, was stolen in the 2000s.

The venue sits in the city center and is easily walkable from main streets and transport points. Check ahead for scheduled events to find the best times to visit and enjoy performances.

The bronze plaque placed at the 1957 inauguration read: "Concha Acústica. Homenagem da Prefeitura ao trabalhador de Londrina. 1° de Maio de 1957". It was stolen in the 2000s, so the dedication to the city's workers survives only in records.