Many websites have drop-downs to assist navigation. Usually this only applies to big sites where sitemaps are necessary and where you want people to get to any part of the site from the home page in one click. Sadly I've never had the challenge to develop any web sites that are that big and diverse in content but there's a time for everything.
Anyway, the Lufthansa site manages to use drop-downs efficiently. This is accomplished with Javascripts, but sadly nothing works if you don't have Javascript disabled. When you roll your mouse over "Worldwide Sites" it shows a drop-down underneath with a looong list of options. It's good because drop-downs are usually very ugly but powerful as navigation tools.