The Ellie Caulkins Opera House, which opened on September 10, 2005, is located in Denver, Colorado

Denver, Colorado

The City and County of Denver is the capital and the most populous city of the U.S. state of Colorado. Denver is a consolidated city-county, located in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains...

 as part of the large Denver Performing Arts Complex

Denver Performing Arts Complex

The Denver Performing Arts Complex located in Denver, Colorado, is the second largest performing arts center in the world after New York City's Lincoln Center. The DPAC is a four-block, site containing ten performance spaces with over 10,000 seats connected by an tall glass roof...

. It seats 2,225. The Caulkins family pledged $7 million towards the enhancement of the lyric opera house and adjacent public spaces which were constructed inside of the Newton Auditorium.
The Municipal Auditorium, the largest in America except for Madison Square Garden in New York, was completed in time to host the Democratic National Convention in 1908.