The dropdown box can with bootstrap select and a countries table. For a full list of cities you would need to find a DB table of those.
For starters take a look at this page:
http://www.elcoderino.com/use-concat-when-populating-dropdown-list-from-database-with-laravel/
A free list can be had from geonames.org :
http://download.geonames.org/export/dump/cities15000.zip
source: http://stackoverflow.com/questions/7457297/where-can-i-find-country-and-city-tables
Found a package with countries, capitals, and currencies:
That's actually a select2 js select box that fetches data with ajax, you can also try google places api
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