Catedral de São Sebastião, also known as Rio de Janeiro Cathedral, is a striking modernist structure built in 1979. Inspired by Mayan pyramids, its conical design reaches 75 meters in height, with a capacity for 20,000 people. The cathedral features impressive stained-glass windows that stretch from floor to ceiling, flooding the interior with colorful light, making it a prominent landmark and a significant religious and architectural site in Rio.