Rainbows and a pot of gold

A structure were a huge rainbow will stretch across the sky with a start and an end. The structure will be made of stained glass and colour accurate wool, As the saying goes there will be a "pot of gold" at the end of the rainbow which you will have to follow and once you reach the end of the rainbow there will be a chest awaiting you full of gold, iron and possibly diamonds! I hope my idea is of interest and comes true :)