The Denver Museum of Nature & Science began with one man, Edwin Carter, who in 1868 moved to a one-room cabin high in the Rocky Mountains and singlehandedly amassed the largest collection of Colorado fauna in existence. In 1908, the museum in Denver formally opened, and it made world headlines when in 1926 museum researchers found fossil proof that North America was inhabited over 10,000 years ago.
Cliff Palace and Balcony House are ancient cliff dwellings that the ancestral Pueblo Indians inhabited in the 12th and 13th centuries. Located in Mesa Verde National Park, both are World Heritage Sites and National Monuments. Balcony House had forty-five rooms and two kivas (ovens), and it can only be accessed on ranger-guided tours. Tour participants must climb a thirty-two foot ladder and then crawl through a twelve-foot tunnel to access Balcony House.