How do I create a drop down menu like the one listed below

I have a need to create a drop down menu like the one on this site- http://www.hill-country-visitor.com/#. When you go there then mouse over the "More/Cities" link, the drop down choices appear in what looks like a table form. Not in a single which would go off the page but appearing in short columns across the page. This menu is not on a WordPress site but anyone have suggestions for how to do this in WordPress?

Thanks,
Larry