EL PASO COUNTY, Colo. (CBS4) – Firefighters climbed the Manitou Springs Incline with all of their gear to mark the 20th anniversary of the Sept. 11 attacks. For the sixth consecutive year, firefighters and military personnel from all over Colorado and other states hiked the more than 2,700 steps.

(credit CBS)

The outdoor attraction takes hikers up nearly one mile with 2,000 feet in elevation gain.

(credit CBS)

Some firefighters also carry a flag with the names of all 343 firefighters who died on that fateful day.