The Pierre Shale formation was deposited during the Paleogene and Cretaceous periods about 70 million years ago. The region was covered by a deep sea—the Cretaceous Western Interior Seaway—which deposited massive amounts of shale on the seabed. Both the thick stratum of shale and embedded marine life fossils—including ammonites and skeletons of fish and such marine reptiles as mosasaurs, plesiosaurs, and extinct species of sea turtles, along with rare dinosaur and bird remains—were created during this time period. The area now known as Colorado was eventually transformed from being at the bottom of an ocean to dry land again, giving yield to another fossiliferous rock layer known as the Denver Formation.[58] 
With its reputation for attracting celebrities and well-heeled travelers, Aspen is one of the world’s most famous ski resorts and one of the best places to visit in Colorado. There’s good reason for the all the hype. Four resorts offer great skiing for every level of skier, from the gentle slopes of Buttermilk Mountain to the ungroomed terrain on Aspen Mountain. During warm weather, visitors can fish for trout from the Roaring Fork River or take shuttles to the nearby 14,000-foot (4,300 meter) peaks of the Maroon Bells to enjoy leisurely hikes around Colorado’s most photographed mountains.
Colorado has no shortage of amazing restaurants to inspire warm feelings. You might opt for the latest offering from a local celebrity chef, such as Alex Seidel, of Fruition and Mercantile in Denver, who was voted one of Food and Wine’s best new chefs in 2010; or Jennifer Jasinski of Euclid Hall Bar & Kitchen, who impressed judges in season 5 of "Top Chef Masters" and also won the James Beard Award for Best Chef Southwest in 2013. Or, you might choose a destination restaurant like Ragnar’s in Steamboat Springs, where getting there is half the fun — guests can arrive only via skis, snowboards or snowshoes.
A nature lover’s paradise, Colorado is filled to the brim with beautiful landscapes, offering travelers over 300 days of sunshine to come and explore its diverse areas. From the majestic Rocky Mountains to picturesque prairies and cosmopolitan cities, Colorado is surrounded by vibrant outdoor attractions, diverse wildlife and scenic byways just begging to be explored. Whether you hit the slopes at a luxury ski resort, hike the trails at a National Park or take a scenic drive through the countryside, Colorado has so many great things to see and do throughout the year. Perfect for families, couples and solo travelers who are looking for an outdoor adventure, read on to discover the best places to vacation in Colorado.
Popular during both the winter and the summer, Crested Butte offers year-round activities that appeal to outdoor enthusiasts. Soak in the crisp mountain air after taking the Silver Queen lift up to 11,875 feet up to see Crested Butte from above, visit the pedestrian-friendly city center with its myriad of locally owned shops, or choose your pick between summer and fall mountain biking and the area’s numerous trails. Those with little ones can head to the Trailhead Children’s Museum, Crested Butte Mountain Heritage Museum or find swimming and hiking at Meridian Lake in the summer.
The Experience: Denver is the perfect urban adventure for anyone who likes midsize cities. It's easy to navigate and manage and doesn't feel at all claustrophobic, but offers endless cultural excursions, gourmet dining experiences, and a fun nightlife you'd expect from large cities. Make sure you visit the Denver Art Museum, check out the breweries in the RiNo neighborhood, and stay at the Crawford Hotel, which is in the old Denver Union Station. For a boutique hotel, stay at The Maven Hotel.
