An Inca bridge
The grass bridge of Q’eswachaka in Peru must surely be one of the engineering marvels of the world and a testament to the power of the community that remakes it each year.
Originally the bridge was constructed as part of the vast Inca transport network which allowed runners to take messages between different parts of the empire. Nowadays the bridge is rebuilt each year in commemoration of the history of the people of the region. An amazing feat, I am sure you will agree!
Thanks to the reader who sent in the link. Absolutely fascinating and maybe one day we will get to see it in person.