Eclipse.

Last time I saw a full eclipse, I was a kid. We had our head in boxes - for about five minutes - before we got bored, went into the gym and played volleyball. Beware of glasses. I'd lean on using a smartphone, or 'live view' on your camera. Voice of experience: I may have a burned-out spot in one eye from shooting sunsets - it happens faster than you imagine, and becomes a lifetime annoyance.