The Cathedral of Toledo and its 5 treasures. The Cathedral of Santa María de Toledo, also called the First Cathedral of Spain, seat of the Archdiocese of Toledo, is a building of Gothic architecture, considered by some to be the great opera of the Gothic style in Spain. Meet with us the 2nd. The largest cathedral in Spain, a tour full of history, art, details and curiosities. Hand in hand you will discover the Chapter House, the Sacristy, The Treasure, The Choir and the High Altar. Let our official guides take you on a journey through time and immerse yourself in the history of this architectural wonder, a World Heritage Site.