You have decided to visit a new country while you are traveling and are located in a foreign country or city and need to find the nearest embassy or consulate office to submit your application for a visa.
Here is a one stop web resource, GoAbroad, which I use and has very good comprehensive information.
There are a lot of web sites out there which may give some information but I find that this web resource is the best with the least advertisements and is direct and to the point.
It is easy and simple to use but I must always remind you that these locations can and sometimes do change. I also recommend that once you get an address Google map the location in advance so you know where you are going and if you are still not sure of a location, try other web searches.