M56 was discovered by Charles Messier in 1779. Most globular clusters are aged remnants from an earlier stage in the evolution of our home galaxy, the Milky Way. But M56 is special because it moves counter to the other material in the galaxy. This is called retrograde motion. Many astronomers believe that this peculiarity is due to this cluster being alien to our galaxy, being absorbed from a dwarf galaxy which at some time during the past merged with us. M56 can only be resolved with a large amateur telescope, but there are many others that are easily found even with binoculars!
Top: Wide-Field - Hewholooks
Bottom: Close-Up - NASA/ESA