  We investigate, theoretically and experimentally, a photonic realization of a
Sawtooth lattice. This special lattice exhibits two spectral bands, with one of
them experiencing a complete collapse to a highly degenerate flat band for a
special set of inter-site coupling constants. We report the ob- servation of
different transport regimes, including strong transport inhibition due to the
appearance of the non-diffractive flat band. Moreover, we excite localized
Shockley surfaces states, residing in the gap between the two linear bands.
