Open Star Clusters M16, M20 & M21, M23 and M25.
About a month ago, very late at night, I had a very first glimpse at the Sagittarius/Serpens zone.
I was able to see, in a exceptional white zone night, this Star Clusters. That region of the sky is truly marvelous, even when observing under light polluted skies.
M16, in Serpens, is known as the Eagle Nebula. It is also known for holding one of the most famous regions in the sky, the Pillars of Creation. Unfortunately I couldn't see the nebula, although averted I saw some very faint nebulosity. Nevertheless, the young Star Cluster is a very beautiful sight. It has a mag. of 6.
M20 and M21, mag 6,3 and 6,5 in Sagittarius, can be seen together in the eyepiece's field of view.
M20, the Trifid Nebula, located in the upper part, is an H-II region. I couldn't see traces of the nebula, but with a H-II filter probably I would.
M21, in the low part, is a star rich Open Cluster, very distinctive and very bright.
An asterism, named Webb's Cross, lies between these two objects.
M23, also in Sagittarius has a mag. of 5,5. Very beautiful Cluster.The number of stars is estimated between 169 up to 414.
M25, the brightest of this objects with a mag. of 4,6, can be seen with binos even in poor conditions like mine. It has 601 stars. It lies in Sagittarius. According to Wikipedia, "The cluster is located near some obscuring features, with a dark lane passing near the center."