Wiktionary
n. (context figurative English) A magical place where one goes to find fulfillment of one's dreams.
Wikipedia
End of the Rainbow is a musical drama by Peter Quilter, which focuses on Judy Garland in the months leading up to her death in 1969. After a Sydney premiere in 2005, the show has played on the West End in London and a Broadway production opened in 2012.
Usage examples of "end of the rainbow".
Sanchez that in it he had a piece off the end of the rainbow with a pot of gold at the end of it, but he couldn’.
Even if we found the site, there was no guarantee that we would discover a clue as to Hank's whereabouts and he was the treasure at the end of the rainbow, no question about that.
Cities needed to be supplied from the country, and cities attracted those people disillusioned with subsistence farming, simply down and out, or those looking for the end of the rainbow, and if a sufficient number came in and a poor underclass developed, there was potential for political ferment, violence, and challenges to the system.
For an increasingly larger portion of humanity, such places are now not just home but the end of the rainbow: the ultimate step-up from a zinc-roofed shack in a shantytown.
Dianne Alder is the target in the case, the pot of gold at the end of the rainbow.