NGC 2170. Source
This beautiful picture of NGC 2170 took my breath away when I first saw it. The nebula to the left reflects light from nearby stars to make this amazing picture.
Pictures like this are the reason I love astronomy. Nebulae are some of the most beautiful things out there. In reality they are just huge blobs of dirty dust, but this dust reflects and emits light when heated in a myriad of staggering ways. The universe is so full of beauty.