We demonstrate for the first time the ability to perform time resolved imaging of terahertz (THz) waves propagating within a photonic crystal (PhC) slab.For LIPOSOMAL VITAMIN C 1000 photonic lattices with different orientations and symmetries, we used the electro-optic effect to record the full spatiotemporal evolution of THz fields across a broad spectral range spanning the photonic band gap.In addition to revealing real-space behavior, the data let us directly map the band diagrams of the PhCs.The data, which are in good agreement with theoretical calculations, display a rich set of effects including photonic band Seasoning gaps, eigenmodes and leaky modes.