Albi Cathedral, officially known as the Cathedral of Saint Cecilia (Cathédrale Sainte-Cécile d'Albi), is the main cathedral and a landmark of the city of Albi, located in southern France. Majestically perched on a rocky bank above the Tarn River, it is one of the most outstanding architectural monuments in the region. The cathedral's foundation was laid in the 13th century, and it was built over approximately two centuries.
The cathedral's main feature is its austere and powerful appearance, which more closely resembles a medieval fortress than a traditional Gothic temple. It is the world's largest brick building, constructed from local material of a characteristic red color. The cathedral is a striking example of the Southern Gothic style, characterized by monumentality and severe, almost defensive features.
Despite its external austerity, the interior is stunningly luxurious. Its vaults and walls are covered with magnificent Renaissance frescoes, covering nearly 18,500 square meters—the largest such ensemble in all of France. It also houses the country's largest and oldest depiction of the Last Judgment, located beneath the famous 18th-century classical organ.

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In 2010, Albi Cathedral, along with the surrounding Episcopal City, was added to the UNESCO World Heritage list, confirming its exceptional cultural and historical value.