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.
The forty-five mile trip takes four and a half hours to ride, as it is still coal-fired, and winds along narrow mountain paths and in and out of canyons. Historic narration is available on the trains for interested tourists. Both the Silverton and Durango ends of the line have railroad museums; the Durango Museum contains artifacts pertaining to the history of railroading, and the Silverton Museum displays a Baldwin Locomotive from 1902 in the original 1882 Depot.
Those looking for a scenic mountain drive will love the Mount Evans Scenic Byway, the highest paved road in North America. The highway rises to a height of 14,264ft (4,348m) above sea level and takes you right to the top of Mount Evans. Along the way, you might spot mountain goats and bighorn sheep as you pass alpine lakes and rock formations. It’s a once-in-a-lifetime drive with plenty of places to stop and snap a photo.

The Annual Flower Trial Garden is a devoted horticultural research garden on the campus of Fort Collins' Colorado State University, open to the public throughout the year near the campus' Center for the Arts. The garden strives to serve as a trial space for the performance of annual plant cultivars in the region's high-altitude Rocky Mountain environmental conditions, with primary annual plantings on display between late May and mid-October. Plant varieties are grouped by genus and arranged by color, with more than 1,000 different cultivars typically on display each year. In addition to the main annual showcase, the garden also presented an annual pansy display, which is planted in fall and on display through the early spring. Perennials cultivated by the garden are also on display year-round across the street from the garden facility.
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.
Kids will enjoy the carousel and trips in airplanes and trains that entertain without being frightening. Island Kingdom Water Park is a huge wet playground within Elitch Gardens with a whole assortment of water slides, including ones with enormous drops, and others that hurtle you at high speed. For families and children there are a lazy river, a wave pool, and slides geared to small tykes.

Cheyenne Mountain Zoo is dedicated to conservation, captive breeding of endangered species, and comprehensive animal care. It aims to give every visitor an experience that will last them a lifetime. Founded in 1926, the Cheyenne Mountain Zoo is, as the name implies, on the slope of a mountain, affording both visitors and animals fabulous views, though it requires stout walking shoes and a degree of physical fitness.
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