According to the original Life Magazine article published in 1952 these photos were taken in the Cathedral of Holy Virgin Protection in New York. In Russian Easter is called “Pascha“; after the all-night vigil the believers declare “Christ is Risen!” and everyone responds “Indeed, He is risen!”.
Russian icon depicting the resurrection. (source)
Sergei Rachmaninov: Liturgy Of St. John Chrysostom, Op. 31
httpvh://www.youtube.com/watch?v=vHmSzN84p6w