Agreed, concerto 2 is (in my opinion) of the most beautiful and epic music pieces ever.
Interesting fact: Carmen's (C. Dion's) All By Myself is largely based on this concerto's 2nd movement. IIRC Rachmaninov is even listed as a coauthor because of a copyright lawsuit.
I already linked a different Igudesman&Joo video in another thread, but this video beautifully shows that: https://www.youtube.com/watch?v=l9akzcgzRaw
Prelude in G minor, Op. 23, No. 5.
Piano Concerto 2. It's long but at least listen to the first 30 seconds, up until the point when the orchestra comes in. This is (in my opinion) one of the greatest moments in all of Western art music.