Gloucester Cathedral, formally the Cathedral Church of St Peter and the Holy and Indivisible Trinity, in Gloucester, England, stands in the north of the city near the River Severn. It originated in 678 or 679 with the foundation of an abbey dedicated to Saint Peter (dissolved by Henry VIII). (source Wikipedia)
Gloucester's historic cathedral cloisters were transformed into the corridors of Hogwart's School of Witchcraft and Wizardry.
For the films anything that would give away the set as a church had to disappear. The haloes on the stained glass figures in the cloister windows were painstakingly covered with coloured plastic filter paper to blend in with the surrounding glass.
One window has figures of Adam and Eve, and because these might have been in shot in the movies, they were given clothes and even the trademark Harry Potter 'lightning flash' on their foreheads.
The wall by Dark Entry is where panelling, made in the studio to look just like the stone walling, was hung with the chilling message in 'blood'. (source http://www.bbc.co.uk/gloucestershire)
Daniel Radcliffe, Rupert Grint, Emma Watson
Cars fly, trees fight back, and a mysterious house-elf comes to warn Harry Potter at the start of his second year at Hogwarts. Adventure and danger await when bloody writing on a wall announces: The Chamber Of Secrets Has Been Opened. To save Hogwarts will require all of Harry, Ron and Hermione’s magical abilities and courage.