  We report direct observation of the development of long-range spatial
intensity correlations and the growth of intensity fluctuations inside the
random media. We fabricated quasi-two-dimensional disordered photonic
structures and probed the light transport from a third dimension. Good
agreements between experiment and theory are obtained. We were able to
manipulate the long-range intensity correlations and intensity fluctuations
inside the disordered waveguides by simply varying the waveguide geometry.
