Piper and Paul Baracani of Piper, Inc took this amazing ghost picture inside the Brown Palace Hotel in Denver, Colorado. They used a "Moditronics Full Spectrum Camera" to capture what looks to be the apparition of a man walking through the lobby. The camera has the visible light spectrum filtered out, seeing only UV and Near Infrared wavelengths. The see-through man was not visible to the naked eye. The exposure time was fairly quick at 1/3 of a second.
The first picture taken in the Brown Palace Hotel shows a man walking toward and behind the couple. The second photo still shows the shoe and leg of the man as he moved past the couple who are still looking ar something on the wall.