1. Basilica of the Holy Blood
Tucked into Burg Square, this double chapel holds one of medieval Europe's strangest relics: a vial said to contain Christ's blood, brought back from the Crusades in the 12th century. The lower chapel, built around 1150, is dark and Romanesque - thick columns, low vaults, the kind of space that feels older than the city itself. Upstairs is the complete opposite: a 19th-century neo-Gothic explosion of gold leaf, stained glass, and ornate carving.
The relic gets paraded through Bruges every May during the Procession of the Holy Blood, a tradition that's been running since the 13th century. The rest of the year, it's displayed in a silver reliquary for a few hours each afternoon. Whether or not you believe in its authenticity, the contrast between the two chapels alone makes it worth a visit. It's one of the few places in Bruges where you can see genuine 12th-century stonework next to 19th-century drama.