diff --git a/src/astrognome.c b/src/astrognome.c
index 03f487e..04f1bf9 100644
--- a/src/astrognome.c
+++ b/src/astrognome.c
@@ -19,6 +19,8 @@ GtkBuilder    *builder;
 GtkFileFilter *filter_all   = NULL;
 GtkFileFilter *filter_chart = NULL;
 GtkFileFilter *filter_hor   = NULL;
+GtkTreeModel  *country_list = NULL;
+GtkTreeModel  *city_list    = NULL;
 GHashTable    *xinclude_positions;
 
 const char    *moonStateName[] = {
@@ -279,6 +281,23 @@ main(int argc, char *argv[])
         return EXIT_SUCCESS;
     }
 
+    country_list = GTK_TREE_MODEL(gtk_list_store_new(
+            AG_COUNTRY_COLCOUNT,
+            G_TYPE_STRING,
+            G_TYPE_STRING
+        ));
+
+    city_list = GTK_TREE_MODEL(gtk_list_store_new(
+            AG_CITY_COLCOUNT,
+            G_TYPE_STRING,
+            G_TYPE_STRING,
+            G_TYPE_DOUBLE,
+            G_TYPE_DOUBLE,
+            G_TYPE_DOUBLE,
+            G_TYPE_DOUBLE,
+            G_TYPE_DOUBLE
+        ));
+
     status = g_application_run(G_APPLICATION(app), argc, argv);
 
     g_hash_table_destroy(xinclude_positions);
diff --git a/src/astrognome.h b/src/astrognome.h
index 6ad04e8..80a1eeb 100644
--- a/src/astrognome.h
+++ b/src/astrognome.h
@@ -12,6 +12,25 @@ typedef struct {
 extern GtkFileFilter *filter_all;
 extern GtkFileFilter *filter_chart;
 extern GtkFileFilter *filter_hor;
+extern GtkTreeModel  *country_list;
+extern GtkTreeModel  *city_list;
+
+enum {
+    AG_COUNTRY_CODE,
+    AG_COUNTRY_NAME,
+    AG_COUNTRY_COLCOUNT
+};
+
+enum {
+    AG_CITY_COUNTRY,
+    AG_CITY_NAME,
+    AG_CITY_LAT,
+    AG_CITY_LONG,
+    AG_CITY_ALT,
+    AG_CITY_TZO,
+    AG_CITY_TZD,
+    AG_CITY_COLCOUNT
+};
 
 const gchar *ag_house_system_id_to_nick(GsweHouseSystem house_system);
 GsweHouseSystem ag_house_system_nick_to_id(const gchar *nick);