  A low twist angle between the two stacked crystal networks in bilayer
graphene enables self-organized lattice reconstruction with the formation of a
periodic domain. This superlattice modulates the vibrational and electronic
structures, imposing new rules for electron-phonon coupling and the eventual
observation of strong correlation and superconductivity. Direct optical images
of the crystal superlattice in reconstructed twisted bilayer graphene are
reported here, generated by the inelastic scattering of light in a nano-Raman
spectroscope. The observation of the crystallographic structure with visible
light is made possible due to lattice dynamics localization, the images
resembling spectral variations caused by the presence of strain solitons and
topological points. The results are rationalized by a nearly-free-phonon model
and electronic calculations that highlight the relevance of solitons and
topological points, particularly pronounced for structures with small twist
angles. We anticipate our discovery to play a role in understanding Jahn-Teller
effects and electronic Cooper pairing, among many other important
phonon-related effects, and it may be useful for characterizing devices in the
most prominent platform for the field of twistronics.
