I just finished binge watching BBC's Race Across the World, Season Four.
I avidly watch Amazing Race, but this is so much better.
The teams had to make their way from Japan to Indonesia without high speed trains or flying. A limited budget, but opportunities to "work" to augment the budget or earn a night's stay.
I like it because each leg is several days, the teams seldom run into each other because they work out different routes, and less focus on hard physical "challenges" means older people can be competitive. The total number of days was 51, if I remember correctly.
Season three was Canada (different teams). Not as good, but then I would think that, wouldn't I? Lol.
So far can't find season one and two on any of our sources.
Definitely recommend!