This weekend’s Doors Open Denver invites the public inside some of the most interesting architectural icons in the city. It’s an admission-free and stress-free event that allows participation at any level. Stop into a building or two, or spend some time experiencing the carefully-curated tours or taking in some of the special, art-inspired side attractions. It’s a good idea to spend some time on the Doors Open Denver website planning out your day or signing up, in advance, for the guided options.