The Vatican is a treasure trove of art, architecture and rarities. This is but one of millions, Gabinetto Del Laocoonte or Laocoön and His Sons; from Wikipaedia:

The statue is attributed by the Roman author Pliny the Elder to three sculptors from the island of RhodesAgesanderAthenodoros and Polyclitus. It shows the Trojan priest Laocoön and his sons Antiphantes and Thymbraeus being strangled by sea serpents.