Temple of Correction
The Temple of Correction is the Ultramarines' vast northern polar fortress that contains the Shrine of Guilliman, a vaulted sepulchre where the body of Primarch Roboute Guilliman resides. The Temple of Correction welcomes millions of pilgrims every year, as the Shrine of Guilliman is one of the most holy places in the entire Imperium.
The Temple is a miracle of construction and typical of the attention to detail to which the Ultramarines apply themselves. Its proportions defy the human mind by the scope and grandeur of design. The multi-coloured glass dome that forms the roof is the largest of its kind. Even the Techno-magi of the Adeptus Mechanicus come to marvel at the structure said to have been designed by Roboute Guilliman himself. According to the Ultramarines, there is enough marble within the temple to build a mountain, and sufficient adamantium and shining plasteel to construct a sizable warfleet.