When you board the plane, have your passport on hand.
A pasaporte is the ocument that proves the nationality and identity of the person who is travelling, and that allows him or her to travel from one country to another.
Whitout the passport, they wouldn't be able to travel.
In the summer of 1911 yale professor amd explorer Hiram Bingham led an expedition through the andes mountains in search of the lost cities of Vitcos and Vilcabamba the last two capitals of the incan empire