Displaying Custom Fields in MT 4.36

I'm struggling to find an explanation of how to display custom fields in MT 4.36 so I'm not sure if I'm missing something obvious, or if it's not possible in the version. Here's what I'm trying to do, and help anyone can provide would be greatly appreciated.

I'm creating a photo blog where I'll be posting photos from various locations. I'm trying to use custom fields to assign metadata to each photo as it's being uploaded and posted. For example, for each photo I'd like to assign the Country, State/Province, City, Neighborhood, Street Address, or ZIP/Postal Code of where the photo was taken. So far, I've got that set up and working as a set of Entry Custom Fields.

You might be asking yourself, "why not just use Categories for that classification?" Well, on the home page of the blog, I need to be able to just display a list of all the countries (or possibly cities). I can't use the categories (or tags for that matter) to delineate between a Country, City, State, etc.

My question is, assuming that my posts all include a value for the Country field, how can I display all of the countries of the photos without it repeating the country name over and over as it loops through the MTEntries container tag?

My current custom field for the country is:

System Object: Entry
Name: Country
Type: Single-Line Text
Required: Yes
Basename: country
Template Tag: entrydatacountry

Any thoughts? I tried the MTBlogCustomField container, but that part of MT5, and I'm still on MT4.36.

Thanks, and let me know if there's more info that would help.