Zay travels by truck across the frozen ice roads of north-eastern Siberia, en route to the Arctic Circle. East Asia, 5000 miles east of Moscow, the province of Yakutia where he's travelling is the coldest inhabited place on earth
Zay journey from the National Palace in the centre of Guatemala City, from where all distances in the country are measured, he heads first to the dramatic ruins of the ancient Maya city of Mixco Viejo in the highlands outside the capital.
For thousands of years Turkey has been at the heart of ancient trade routes linking China and Europe that have brought silk, exotic spices, new cultures and ideas through Turkey - to the west and beyond.
Tough Trucks - Iceland, takes viewers on a spectacular scenic journey with host Laura Guiauchain along the highways and back roads of the Nordic island country - across black desserts, bare volcanic rock and through rivers.