The Lagoon Nebula (Messier 8, M8, NGC 6523) is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region. The Lagoon Nebula was discovered by Guillaume Le Gentil in 1747 and is one of only two star-forming nebulae faintly visible to the naked eye from mid-northern latitudes.
Source: 1, 2, 3, 4, 5 (Original post had 6 images, and the 6th link directed to Omega nebula, which is also in Sagittarius although it is not the Lagoon. I apologize for the confusion - I was saving that for another post and my files got mixed up. haha)