There was a lot of art alongside empty galleries on Sunday, the last day the Denver Art Museum's North Building was open before a years-long closure.

Even during the Denver Broncos game underway a short distance away Sunday afternoon, people flocked to the castle-like structure to wander the halls one last time -- and even to leave behind a farewell message on the walls of the lobby.

The museum waived admission charges Sunday for a "See You Later, North Building" party that included art activities, kids' projects and a DJ playing '70s and '80s music to represent the 45-year-old building's history.

And the 7th floor rooftop observation area -- usually closed to visitors -- was open, offering a spectacular view of downtown Denver.

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