orbs are not always dust, and this looks like a historic place. orbs are spirits moving within balls of light, and if you've ever watched DVD's such as Ghosts of Buck's County, you can see the orbs appearing on the live camera and moving about.
This is another photo of the "Ghost Tour" at the Crescent Hotel in Eureka Springs, Arkansas. It is well known for its hauntings, however, the so-called orbs in this photo are more camera flash off of the high gloss paint on the doors and frames. See the light shining on the door frame on the right of the guy on the far right?
Not a member yet ? Click here to join - registration is free and only takes a moment!