John Williams wrote the theme everyone knows
John Williams scored the first three films, and the motif he wrote for them carried through the rest of the series even after other composers took over.
Fuente: English Wikipedia, individual film articles
Las películas 1 · 2001
An orphan learns on his eleventh birthday that he is a wizard, and leaves an unhappy home for a boarding school hidden from the non-magical world. The first film establishes the school, the friendships and the mystery of an object kept under guard on the third floor.

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John Williams scored the first three films, and the motif he wrote for them carried through the rest of the series even after other composers took over.
Fuente: English Wikipedia, individual film articles

England
Alnwick Castle
Interpreta
Courtyard used for flying lessons
A working castle in Northumberland, lived in by the same family since the fourteenth century. Its outer bailey stood in for the school grounds in the first two films.
Clementp.fr / CC BY-SA 4.0 (Wikimedia Commons)

England
Durham Cathedral
Interpreta
Cloisters and corridors
A Norman cathedral and UNESCO site whose cloister walks appear as school corridors. It is an active place of worship, open to visitors most days.
mattbuck (category) / CC BY-SA 4.0 (Wikimedia Commons)

England
Gloucester Cathedral
Interpreta
Corridors and the hospital wing
Its fan-vaulted cloister is among the finest in England and one of the most recognisable interiors in the early films.
Geni / CC BY-SA 4.0 (Wikimedia Commons)

England
King's Cross railway station
Interpreta
The departure platform
A working London terminus. The platform scenes were shot here, though the arched brick backdrop most people picture is from the neighbouring station.
The wub / CC BY-SA 4.0 (Wikimedia Commons)

England
Leadenhall Market
Interpreta
The wizarding shopping street
A covered Victorian market in the City of London, with painted ironwork and cobbles, used for the entrance to the shopping street.
Diliff / CC BY 2.5 (Wikimedia Commons)

England
Lacock Abbey
Interpreta
Classrooms and corridors
A medieval abbey turned country house in Wiltshire; its chapter house and cloisters served as classrooms in the first two films.
Diliff / CC BY-SA 3.0 (Wikimedia Commons)

England
Christ Church, Oxford
Interpreta
The staircase and hall
An Oxford college whose fan-vaulted staircase and dining hall inspired and partly provided the school's great hall.
Dmitry Djouce / CC BY 2.0 (Wikimedia Commons)

England
Bodleian Library
Interpreta
The library and infirmary
Oxford's main research library, in use since the seventeenth century. Its Duke Humfrey's reading room appears as the school library.
Honcques Laus / CC0 (Wikimedia Commons)