In an annual tradition reminiscent of another era, hordes of livestock take over the Spanish capital once a year http://on.natgeo.com/2m53sv4

In an annual tradition reminiscent of another era, hordes of livestock take over the Spanish capital once a year http://on.natgeo.com/2m53sv4 

https://twitter.com/NatGeoTravel/status/949475647918833664