This was the Seattle Center Bubbleator. A hydraulically driven clear glass "bubble" that illustrated in 1962 how elevators would be driven in "the future".
And having personally rode the "Bubbleator" several times from the 1970s and early '80s, for the LEAST, I can say I was disappointed when this legendary ride of the 1962 Seattle World's Fair ended up as a greenhouse in some rich yuppie's yard.
It was heartbreaking really. You just DON'T throw away HISTORY like THIS.