The Basilica of the Holy Blood, on the Burg, is actually two churches stacked on top of each other. The lower Romanesque chapel of Saint Basil dates from the 12th century and is one of the most complete Romanesque interiors in Belgium — dim, low-vaulted, and austere. The upper Gothic chapel above it was built to house the relic of the Holy Blood and is altogether more ornate, with gilded woodwork and stained glass.
The relic itself — a phial said to contain Christ's blood, brought to Bruges by Thierry of Alsace after the Second Crusade — is displayed in a later 16th-century reliquary studded with gold and jewels. Entry to the basilica is free; the reliquary and treasury cost a small fee to view.