Three things drive every international wedding's legal process. One: the host country's own civil-marriage requirements, which range from "light" (Portugal, four to six weeks) to "functionally impossible" (Maldives, not available to foreign non-Muslim couples). Two: your home country's document requirements and whether it signed the Hague Apostille Convention (most Western countries did). Three: the specific translations, apostilles, and consular registrations required on your home-country documents before they can be submitted abroad.
The combination of the three determines whether a legal ceremony on-site is practical. For most international couples at most destinations, it is not. So the honest default is: marry legally at home, hold a symbolic ceremony abroad. The symbolic ceremony is indistinguishable from a legal one in every sense that matters to your guests; it frees you from eight to twelve weeks of paperwork; and your photographs are the same either way.
The table below is the country-by-country summary. Use it to assess whether a legal on-site ceremony is viable for your destination; if not, the symbolic option is waiting.