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National Basilica of the Sacred Heart
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Belgium
💡 On 13 October 1951, the National Basilica of the Sacred Heart opened its doors in Brussels, Belgium, decades before construction was finally finished in 1970. King Leopold II had laid its first stone back in 1905, during the celebrations marking the 75th anniversary of Belgian independence, and the finished church ranks as the 17th largest by area in the world and the largest in Belgium.