Reservoir re-housed, historical artifacts moved or rare environments relocated. Examples include the temples of Abu Simbel (which were moved before the construction of the Aswan Dam to create Lake Nasser from the Nile in Egypt), the relocation of the village of Capel Celyn during the construction of Llyn Celyn, and the relocation of Borgo San Pietro of Petrella Salto during the construction of Lake Salto. Construction of a reservoir in a valley will usually need the river to be diverted during part of the build, often through a temporary tunnel or by-pass channel. In hilly regions, reservoirs are often constructed by
Egyptian temple enormous obelisks, were removed by outside governments and private collectors. This wave of Egyptomania resulted in the rediscovery of temple sites such as Abu Simbel, but artifacts and even whole temples were often treated with great carelessness. The discoveries of the period made possible the decipherment of Egyptian hieroglyphs and the beginnings of Egyptology as a scholarly discipline. Nineteenth-century Egyptologists studied the temples intensively, but their emphasis was on collection of artifacts to send to their own countries, and their slipshod excavation methods often did further harm. Slowly the antique-hunting attitude toward Egyptian monuments gave way to careful study and