There have been a few. The most memorable I'd have to say was the birth of my son. The image of his tiny wrinkled face, arm stretched over his head, and one eye closed and one eye opened when he arrived, will be with me for the rest of my life.
Any sunset will make me stop and admire, only to have my straight A student son say, "Mom, it's pollution that makes those colors." Yes, I know, but its still amazing!
I'm also a fan of thunder and lightning, tornadoes, hurricanes. Of course, the damage they do can be horrifying and sad, but it amazes me what mother nature is capable of. A reminder to never cherish material things because you never know when a storm may come and take it away.
Currently, I have to say the most breath-taking scene has to be my home state. We had two days of rain here in Rhode Island and if I didn't see the mall under water, I wouldn't have believed it. The homes and businesses that have been ruined are endless.
Here is a you tube video of the mall. http://www.youtube.com/watch?v=uBdZN3tTo34