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Photo: via Wikimedia Commons, CC BY-SA 3.0
A gorgeous domed building at the southern edge of Downtown. Tours are available, though the big attraction for tourists is standing above the words "One Mile Above Sea Level" engraved into one of the steps out front. Free tours start at the visitor information desk every hour M-F 10AM-3PM.
The Colorado State Capitol Building, located at 200 East Colfax Avenue in Denver, Colorado, United States, is the home of the Colorado General Assembly and the offices of the Governor of Colorado, Lieutenant Governor of Colorado, and the Colorado State Treasurer.
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The center has many displays and exhibits focusing on historical sites throughout Colorado (prairie settlement, mine, Native American life, etc.) Great for families with kids and even adults; only takes 1-1½ hours to take in.
This restored Victorian was once home to labor reformist, actress and Titanic survivor Margaret Brown. It now showcases that era of Colorado history through exhibits and special events. Museum is limited to 16 visitors at a time, so purchasing tickets in advance is highly recommended.
A huge museum with art from all over the world. You'll want to give yourself several hours to properly explore the place.
Byers-Evans House Museum
One of Denver's great historic homes, built in 1883 by Rocky Mountain News publisher Williams Byers and elegantly furnished with original turn of the (20th) century pieces. Tour the house or catch featured exhibitions in the gallery.
Clyfford Still was in the first generation of US abstract expressionist artist of the early-mid 20th century. He pioneered the path which Rothko, Pollock, and others followed. But Still was not concerned with fame or sales, which is why you have heard of the others but not Still. And so he kept most of his works, and his will called for a city to create a museum to exhibit the whole collection, intact, which was a very Still move. Denver rose to the challenge, and the result is this museum: fascinating architecture with fascinating contents. The curators are interested not just in Still's work but in the questions it raises, such as how to preserve forever drawings which fade with light and paintings which darken with time.
Kirkland Museum of Fine and Decorative Art
Fine and Decorative art museum featuring over 30,000 works by more than 1,500 artists and designers. Building was moved in 2016.