International organizations (treaty organizations, economic and political alliances and unions) come in a number of forms. Their sites (particularly for treaty organizations and alliances) often have .int at the end of their URLs.
While it is fairly common for countries to have a publicly available website (or several such sites) for their various departments and agencies, not all do. Among those that do, some are more complete than others, some provide greater access to documents and tools than others, etc. While many have sites or documents available in multiple languages (including English), some do not. This can make it a bit tricky to find what you're looking for!
Some ways to find official government sites:
Be careful not to confuse a tourist site (which may be run by a foreign affairs or tourism ministry) for a main government site. When you do find a government or government agency's site, take some time to click around on it to find links to other agencies or parts of the government. Some national governments (like Ghana, for example) have individual sites for their particular ministries and offices, but no single portal site through which to reach them; these are cases in which finding ministry names and searching for them along with the ccTLD code would be useful.
Below is a selection of official national sites and/or government sites, meant to serve as an example of how these sites are usually built and used. Some are more current or complete than others. Most of the links here go to English-language versions of these sites, although not all sites have useful English-language equivalents.