Nearly everyone knows the Pleiades in Taurus. Easily visible to the unaided eye, M45, although it looks like a mini constellation, is a true cluster - stars moving through space together. The Pleiades are the first harbinger of winter, dragging up with them the Hyades and Orion. Traces of the nebula from which the cluster was formed can be seen in the close up photograph.
M45 lies close to the ecliptic, the path of the planets across the sky, so it has the occasional visitor. In October 2005 Mars passed close by. Then in early April 2012 Venus passed right through the cluster.