Find great value on Frontier Airlines flights from CHI to DEN when you book with CheapOair! Known as the Mile High City, Denver is a bustling metropolis with a beautiful rocky mountain backdrop. With the State Capitol Building on one side and the Major League Baseball stadium at the other end, Denver distinguishes itself in every facet. The city is home to almost 17 historic buildings including the Clements District and the Capitol Hill. To entertain and educate the young ones, the Children’s Museum of Denver offers great hands-on activities and makes learning a fun experience. The Denver Art Museum houses a large collection of art pieces from all over the world while the Denver Mint offers a tour of how money is created. Beer lovers make way to the Great Divide Brewing Co. that offers free sampling and a tour on how your favorite beer is made. Other important attractions of the city include History Colorado Center, Museum of Contemporary Art Denver and the Denver Botanic Gardens.