Salzburg, Hanmer, Rotorua, and Prague... all places where you can go and run a marathon this weekend if you fancy it.
Meanwhile in Italy, three of the world's top distance runners will be racing around the Formula One track at Monza in an attempt to run the first sub-2 hour marathon.
The whole endeavour is being bankrolled by a huge global sportswear brand in an effort to sell more running shoes. Nothing has been left to chance, no detail has been overlooked.
How often the athletes should drink, what the weather will be, the best formation to run in to reduce drag – check, check, and check.
Everything will be monitored in real time by internal sensors the runners have swallowed and wearable chips that track their performance, their temperature, and how well their bodies are responding under this incredible stress.
So can the 2-hour mark really be broken? And what can this tell us about the limits of human performance, shoe design, and even how tight your running shorts should be?