One of the most spectacular sights through a telescope's eyepiece is the planet Saturn. Its iconic rings are so obvious even in small telescopes that they cause gasps from first-time viewers. I can't even tell you how many people maintain asked whether they're real when I show them Saturn through my own 'scope. The notice of awe and joy on their faces is one of the biggest reasons I admire showing off the planet.
Source: blastr.com