Traditional synthesis of inorganic/organic hybrid materials employing organic molecules as a structural directing agent has resulted in many solids with special frameworks. We have recently discovered a new class of transition-metal-oxide based composite solids via the inclusion of alkali and alkaline-earth metal halides. These new salt-inclusion solids (SISs) were synthesized by high-temperature ceramic methods employing reactive molten salt. Single crystal structure studies revealed a new type of composite frameworks made of mixed covalent and ionic lattices. The incorporated salt exhibits promising structural directing effects giving rise to a number of fascinating hybrid lattices containing nano-structured transition-metal-oxide frameworks. Depending upon the composition and, subsequently, the coordination environment of halide anions, the resulting covalent lattice varies from clusters, sheets, to porous structures. Due to the weak interaction between the two chemically dissimilar lattices, in some cases, the salt lattice is removable showing the de-intercalation and re-intercalation reactions of technological importance. In this presentation, I will present selected families of composite solids that exhibit novel host/guest structure relationships. I will also present some highlights on the recent synthesis of water-soluble SISs containing transition metal oxide clusters.