Unlocks the Builder ability to construct a Qhapaq Ñan, unique to Pachacuti.
Acts as a movement portal on a mountain range, allowing units to move into it and exit from another portal at the cost of 2 Movement. Multiplier of Gold yield from districts at their destination Trade Routes passing through Qhapaq Ñan is set to +100% (max. +100%). Can only be built on an adjacent Mountain tile. Cannot be pillaged or removed.