I have two:

1. Waves glowing with bioluminescence during a red tide. We didn’t know it would be going on and were just camping by the beach. Walking on it at night, we all saw the waves glowing and weren’t sure it was real. As we got closer, our footsteps in the area where the waves were rolling in and out were glowing as well. Just surreal.
2. A house blowing up. Guy opened a natural gas valve in the house and touched it off. Insulation shot way up in the air and the house itself bowed outwards in basically every direction, stayed standing though. At least until it burned down.

Seeing a massive cumulonimbus cloud structure from a plane. The diagrams in university don’t do it justice.

Rolling hills - or rather - mountains, of pure snow reflecting the sunlight, where it was all white and it seemed like an alien landscape, where I had landed somewhere not present on earth

An art exhibit in Brisbane, the artist used a bunch of plastic sheets that were slightly tinted, but when you looked at the sheets through other plastic sheets, they were vibrantly brilliant colour.

I once saw the moon rise in Italy which was five times its usual size… people were gawking at it as if it was the second coming of Jesus H. Christ, hot damn.