SCOTTSBLUFF, Neb. (AP) — Nebraska tourism officials say they’ve seen an uptick in the number of participants in a program that challenges travelers to explore the state and receive stamps in a passport-like book along the way.

The Nebraska Tourism Commission selected 80 stops throughout the state for its 2016 program, challenging travelers to explore Nebraska and collect stamps proving they’ve been to each site.

The tourism commission says more than 26,000 travelers participated in the program and 1,292 passports were submitted for prizes, more than double the amount submitted in 2015.

Passport sites change each tourism season. This season stops included Agate Fossil Beds National Monument in Harrison, Scotts Bluff National Monument and the Mignery Sculpture Garden in Bartlett.