o A museum in itself, it hosts the Osor Evenings of Music during the summer
o The Town Museum - formerly the Town Hall, from the 15th century (with remains dating from the Early Christian times and earlier)
o The Osor Archeological Collection
o The Cathedral, built between 1463 -1498 (in the direction N-S) with a wooden, painted casket
o The town walls
o The Museum of Church Art in the former Bishop's Palace
o The antique floor mosaic in the graveyard Church of St. Mary and the hexagonal baptismal font from the 5th- 6th century