While Thailand was the first country I came across a Tuk-Tuk, I got to see many more and now I am fascinated by the many Tuk-Tuk versions I have seen around the world.
Thailand: Photo from http://www.into-asia.com/bangkok/tuktuk/
Cambodia: These guys have all kinds of Tuk-Tuk versions
Cambodia Tuk Tuk Truck
Vietnam: Manual Tuk-Tuk
Cuba: They call it Coco Taxi
UK: Even the UK have started selling Tuk-Tuks. Photo from http://www.tuk-tukimportsuk.co.uk/