Louis Science Center has entranced me since I was a child. 
The ball race at the St. Louis Science Center has entranced me since I was a child.
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The ball race at the St
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Louis Science Center has entranced me since I was a child. 
The ball race at the St. Louis Science Center has entranced me since I was a child.
Google+: View post on Google+
They have one of these at the Fort Lauderdale Museum of Discovery and Science too, and it is pretty interesting.
The one at the Franklin Institute in Philadelphia travels from room to room, drawing people toward it. No two of these ball coasters are alike.
I want to go to there
What is it?
It's a a bunch of balls on metal tracks that roll all around the building to loops, spirals, and jumps.