What musical piece is Tchaikovsky perhaps best known for?

Tchaikovsky is perhaps best known for his Ballet "Swan Lake," which features a hauntingly beautiful score and has become a staple of the ballet repertoire. Another iconic work is his "1812 Overture," celebrated for its powerful orchestration and incorporation of cannon fire. Additionally, his symphonies, particularly the "Symphony No. 6," known as the "Pathétique," showcase his emotional depth and are widely recognized.