Colorado has one of the most diverse plant and animal environments of the United States, partially due to the dramatic temperature differences arising from varying elevation levels and topography. In dry climates, the average temperature drops 5.4 degrees Fahrenheit with every 1,000 foot increase in elevation (9.8 degrees Celsius per 1,000 meters). Most of Colorado is semi-arid with the mountains receiving the greatest amount of precipitation in the state.[64]
A small mining camp not so long ago, Boulder is a modern, sophisticated town at the base of the Flatirons, popular among extreme sports folks and lovers of magnificent nature of all ages. Stroll through the charming downtown with the popular Pearl Street Mall. Discover Boulder’s past at the Boulder History Museum located in the beautiful historic Harbeck-Bergheim House. Boulder Museum of Contemporary Art not only has a range of permanent and temporary exhibits, but also popular educational programs.
No matter the season, Crested Butte is one of the best weekend getaways in Colorado. It has some of the region’s most challenging ski runs in the winter at the Nordic Center or Crested Butte Mountain Resort (plus beginner and intermediate-level options), and offers a mix of hiking and water sports in the summer. Feeling lazy? One of Crested Butte’s most popular activities is driving down Kebler Pass for stunning mountain views—no walking required. 

Within the boundaries of Rocky Mountain National Park, more than 100 peaks rise above 11,000 feet in altitude, including Longs Peak at 14,259 feet. These amazing mountains cradle the Estes Valley, providing residents and guests with incredible beauty and inspiration. Many of the taller peaks make up the Continental Divide, where snowmelt runs either west to the Pacific Ocean or east to the Atlantic. The park's vistas are accessible by horseback, on foot, or by car - the most notable vehicle route being Trail Ridge Road, the highest continuously paved highway in North America. No matter your level of interest, adventure awaits you while viewing, exploring and appreciating this breathtaking collection of mountains. 
An excellent vacation destination for visitors who are ready to hit the slopes, winter enthusiasts flock to Telluride every year for its 1,700 skiable acres that cater to both experts and novices alike. Visitors flock to Town Park on the southeast edge of town for its abundance of activities available, such as swimming pools, tennis courts, fishing ponds and campgrounds that are popular for the city’s annual festivals and events. Bear Creek Falls and Bridal Veil Falls offer a variety of scenic hiking trails, while the Telluride Historical Museum and Historic Sheridan Opera House are two cultural attractions that shouldn’t be overlooked.
Brush up on your Lindy Hop and head to this one-of-a-kind ball that celebrates all things 1940s each June. A hangar at the Boulder Municipal Airport is transformed into a dance hall befitting the USO, with 1940s cars, celebrity impersonators, swing dance lessons, live music and an authentic-attire contest that’ll make you feel like an extra in “Casablanca.” 
Every summer, Aspen gets taken over by classic music lovers during the renowned Aspen Music Festival and School with more than 300 concerts. Learn about Aspen from Dean Weiler during one of his popular Aspen Walking Tours and pay respect to John Denver at the John Denver Sanctuary you will pass by while hiking the picturesque Rio Grande Trail. Next read: best Aspen restaurants.
Brian and I descended back to ~7,000 feet for dinner in a small-town Indian restaurant in Nederland, Colorado, west of Boulder. By then, both our heads ached like a bad hangover, and my lungs literally burned when I tried to inhale anything but shallow breaths. Add generalized joint pain, and I had a full-blown case of altitude sickness. Given that I am a noted hypochondriac, I expected the worst.
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