What's a space needle?

One more picture from Seattle, the view from the parking lot as we were leaving.  It was cute, when we were driving into the city, Ava and Harper were oohing and aahing at all of the lights.  Ava said she wanted to live in a city, it was so pretty.  They were impressed, but not with the Space Needle, they couldn't understand what it was and our explanations didn't help a bit.  It was a long day, we didn't get home till midnight, but what fun, and these two were so good.