The Metropolitan Cathedral of Saint Sebastian is one of the most unusual and iconic landmarks in Rio de Janeiro. It is the city's main Catholic cathedral, capturing the imagination with its futuristic appearance. Unlike traditional churches, it is built in the Modernist style and shaped like a giant truncated cone, making it resemble ancient Mayan pyramids.
The building, located in the city center, is impressive in its scale. It stands 75 meters tall and can accommodate up to 20,000 people. One of the most striking features of the interior is the four massive rectangular stained-glass windows that stretch from floor to ceiling to a height of 64 meters. On sunny days, they fill the vast cathedral space with mystical, multicolored light, creating an unforgettable atmosphere. 
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The cathedral is dedicated to Saint Sebastian, the patron saint of the city, highlighting its spiritual significance for all of Brazil. Its unique architecture and central location make it a must-visit for not only the faithful but also anyone interested in modern architecture and culture.