Glasgow Cathedral is the oldest building in the city, founded by St Mungo in the 6th century and rebuilt in its present Gothic form between the 12th and 15th centuries. It sits on the Cathedral Hill in the medieval heart of the city, facing the Victorian necropolis across a narrow valley. The interior is stark and impressive: grey stone, ribbed vaulting, and very little ornament — Protestant Scotland stripped the colour but left the bones.
The crypt beneath the choir is the most atmospheric part of the building, arranged around the shrine of St Mungo (the city's patron saint) and filled with forest-like columns. Above ground, the nave's proportions are perfect Gothic: high, narrow, and intensely vertical. The cathedral is an active Church of Scotland parish and holds services daily; free to enter outside service times.