The Washington Post Sunday - - THIS WEEK - Catlin is a free­lance writer.

Es­ti­mated length, in miles, of the road sys­tem, which fed off two main roads north to south, one along the coast and the other through the An­dean high­lands.


Mod­ern-day coun­tries tra­versed from north to south by the roads: Colom­bia, Ecuador, Peru, Bo­livia, Ar­gentina and Chile.


Ap­prox­i­mate num­ber of years the road sys­tem was in use un­til the Span­ish in­va­sion of 1532. Num­ber of ear­lier cul­tures whose routes were adapted by the In­cas: Wari, Ti­wanaku and Chimu.


Height, in feet, of the high­est moun­tain pass on the 20-mile spur to Machu Picchu.


Length, in me­ters, of the most fa­mous rope sus­pen­sion bridge, made us­ing braids of reed or grass. It crosses the Apuri­mac River near Cusco.


Ob­jects in the show, in­clud­ing gold or­na­ments, shell neck­laces, sil­ver and gold fig­urines, stone carv­ings and tex­tiles.

800-100 B.C.

Es­ti­mated age of old­est ar­ti­fact on dis­play: a ce­ramic stir­rup-spout bot­tle from the Chavin cul­ture.


Re­gions that made up the em­pire: Chin­chay­suyu, Antisuyu, Col­la­suyu and Con­tisuyu, with the cap­i­tal of the re­gions, Cusco, in the cen­ter of what is now Peru.


Num­ber of years in­dige­nous peo­ple have been con­tin­u­ously re­mak­ing a sus­pen­sion bridge north of Cusco.


Length, in feet, of a rope sus­pen­sion bridge to be built on the Na­tional Mall for the cur­rent Smith­so­nian Folk Life Fes­ti­val.


Days left in the Smith­so­nian Folk­life Fes­ti­val Mar­ket­place in the mu­seum’s Po­tomac Atrium, clos­ing July 12. Years that cu­ra­tors Ramiro Matos and Jose Bareiro spent re­search­ing the ex­hi­bi­tion.


Months the ex­hi­bi­tion will be open at the mu­seum.


The Great Inka Road: En­gi­neer­ing

an Em­pire Through June 1, 2018, at the Na­tional Mu­seum of the Amer­i­can In­dian, Fourth Street and In­de­pen­dence Av­enue SW. 202-6331000. nmai.si.edu.

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