What are the names of the landmarks in Colorado?

In alphabetical order -

Bent's Old Fort La Junta
Adobe fort built in 1833 on the Santa Fe Trail, to trade with Plains Indians and trappers.

Central City/Black Hawk Historic District
Restored historic buildings in downtown Black Hawk
Former gold mining camps in the Front Range of the Rocky Mountains, were once known as the 'Richest Square Mile on Earth. Now home to several gambling casino's.

The Chautauqua Academic Hall Boulder
This 1898 Chautauqua is the only one West of the Mississippi, one of only four continuously operating since its inception, and the only one open year round.

Cripple Creek Historic District Cripple Creek,
The gold mining town of Cripple Creek and the surrounding hills.

Durango-Silverton Narrow-Gauge Railroad
Narrow gauge mining railroad which has run continually to serve as a tourist line between Durango and Silverton.

Georgetown-Silver Plume Historic District
Historic district which includes the silver mining towns of Georgetown and Silver Plume as well as the 1884 railway engineering marvel, the Georgetown Loop, l which connects them.

Granada War Relocation Center
World War II Japanese American internment center.

Leadville Historic District
Historic Leadville, Colorado mining district and village area.

Lindenmeier Site
The only extensive Folsom culture campsite yet found with artifacts dating from approximately 11200 BCE to 3000 BCE.

Lowry Ruin Lowry Pueblo
Ancient Pueblo Peoples archaeological site from 1060 with a very large kiva.

Mesa Verde Administrative District
First buildings built by the National Park Service with intent to reflect cultural traditions in the park area, built in 1921.

Philadelphia Toboggan Company Carousel No. 6
Carousel built for Elitch Gardens in 1905. In 1928 it moved to Kit Carson County fairgrounds where it remains open today. It is the only antique carousel in America retaining its original paint on both the scenery panels and the animals, and it is the only surviving Philadelphia Toboggan Company menagerie carousel.

Pikes Peak
Pike's Peak (everything above 14,000 feet (4,300 m) elevation). This mountain was inspiration for 'America the Beautiful' as well as the motto 'Pike's Peak or Bust'.

Pike's Stockade
Explorer Zebulon Pike set up a fort here.

Raton Pass
Mountain pass between New Mexico and Colorado.

Rocky Mountain National Park Administration Building
Also known as the Beaver Meadows Visitor Center, it was designed by Taliesin Associated Architects, their first major work after Frank Lloyd Wright had died. It demonstrated modern architecture could be successful inside the National Parks and was the last significant project in Mission 66.

Shenandoah-Dives (Mayflower) Mill
Only surviving example of a selective flotation mill in Colorado.

Silverton Historic District Grand Imperial Hotel
Former silver mining town, home of the Shenandoah-Dives (Mayflower) Mill and one end of the Durango-Silverton Narrow-Gauge Railroad.

Telluride Historic District
Former gold mining boomtown, it is now an artistic retreat and a ski resort town.

United States Air Force Academy, Cadet Area
Bold use of Modern architecture at the United States Air Force Academy, especially with the Cadet Chapel.