Cafe Sua Da (Vietnamese iced coffee with sweetened condensed milk): According to the website, this classic Vietnamese drink is widely available throughout the world, but it’s an especially delicious treat to seek out while visiting Vietnam.
Rounding the list of top 15 include Flat White — Australia, 
Espresso Romano — Italy,
Indian Filter Coffee — India,
Pour Over — Sweden,
Café Cubano — Cuba,
Cafe au Lait — France,
Café Bombón — Spain,
Mélange — Austria,
Frappé — Greece,
Café de Olla — Mexico,
CafèTouba — Senegal,
Pharisäer — Germany,
TürkKahvesi — Turkey,
Ethiopian Coffee Ceremony — Ethiopia