View source for Zihao "Maxwell" Lu Map

In my map, I includes the house, train stations and the market. 
<html>
<br><iframe src="https://www.google.com/maps/d/u/1/embed?mid=18Xn7bFhU_GcsDxHSIyObCsIOcwk" width="640" height="480"></iframe>
</html>