Most dreams are fleeting, forgotten soon after your eyes open, but now and then a dream gets stuck in long term memory. What dreams have stayed in your head for decades?

Some of mine...

A modern city in ruins, plants growing everywhere. A jetplane flying overhead, and as it flies, it leaves a succession of half a dozen perfect circular rainbows.

The interior of a huge building made entirely of translucent green glass, including a bathroom and a great room with long glass tables, chairs, couches.

A grave mound in the woods, quaking and cracking, and after a moment of fear and horror, opening to reveal a cat and her nursing kittens.

Leaping hopelessly into a deep lake to escape a pursuing invisible menace, and unexpectedly being borne across to the other side by invisible hands wrapped around my ankles.

An ascending long whistle; as the pitch rises, I also rise and float away until the pitch descends and I am gently deposited on the ground (had variations on this theme many times through childhood).