  An important step in understanding the exotic electronic, vibrational, and
optical properties of the moir\'{e} lattices is the inclusion of the effects of
structural relaxation of the un-relaxed moir\'{e} lattices. Here, we propose
novel structures for twisted bilayer of transition metal dichalcogenides
(TMDs). For $\theta\gtrsim 58.4^{\circ}$, we show a dramatic reconstruction of
the moir\'{e} lattices, leading to a trimerization of the unfavorable
stackings. We show that the development of curved domain walls due to the
three-fold symmetry of the stacking energy landscape is responsible for such
lattice reconstruction. Furthermore, we show that the lattice reconstruction
notably changes the electronic band-structure. This includes the occurrence of
flat bands near the edges of the conduction as well as valence bands, with the
valence band maximum, in particular, corresponding to localized states enclosed
by the trimer. We also find possibilities for other complicated, entropy
stabilized, lattice reconstructed structures.
