This is a long shot

An incredible film, 2000 cast members, 3 orchestras, 1 camera, 1 continuous shot.

Directed by Alexander Sokurov in 2002, Russian Ark was filmed entirely in the Winter Palace of the Russian State Hermitage Museum using a single 96-minute steadicam shot. It’s a dreamlike reflection of 300 years of Russian history. It could be said the main character in the film is the palace itself, home to the Russian monarchs and to so much history. This could be the ark of the Russian soul, keeping it safe from harm.

The Russian Ark Trailer (2002)
A 19th century French aristocrat, notorious for his scathing memoirs about life in Russia, travels through the Russian State Hermitage Museum and encounters historical figures from the last 200+ years. Entirely filmed in the Winter Palace of the Russian State Hermitage Museum using a single 96-minute Steadicam sequence shot. The film was entered into the 2002 Cannes Film Festival.

In One Breath | Alexander Sokurov’s Russian Ark (Making of)
Behind the scenes documentary on the filming of Russian Ark.

Russian Ark (2002) trivia
The film’s final, hypnotic dance sequence was a recreation of a 1913 gathering which marked the final ball ever held in Csarist Russia. It should be noted that the sequence was filmed in the exact same ballroom that was used in 1913, and that the room had not been used for dancing since that pre-revolutionary time.