The so-called Powder Tower originally served as one of the Riga defensive system buildings. There is no information on the exact date of the construction, but the first tower on this place was built in the 13th century. The name of a tower - Powder, has appeared later. In documents for the first time this place has been mentioned in 14th century by the name of Sand tower. The modern tower has been constructed on a boundary of 15th and 16th centuries. During the centuries it has been collapsed and later restored. The entrance of the tower was at the height of 5 meters, and it was possible to get to a tower only having walked upstairs.
After the Great Northern War the Powder Tower lost its military value. Tower reconstruction was began in the end of 19th century. The new pointed roof has been constructed. Last time the tower has endured reconstruction after the First World War when the Military museum of Latvia has been situated in it.
References:The Temple of Edfu is one of the best preserved ancient shrines in Egypt. It was built in the Ptolemaic Kingdom between 237 and 57 BC.
Edfu was one of several temples built during the Ptolemaic Kingdom, including the Dendera Temple complex, Esna, the Temple of Kom Ombo, and Philae. Its size reflects the relative prosperity of the time. The present temple initially consisted of a pillared hall, two transverse halls, and a barque sanctuary surrounded by chapels. The building was started during the reign of Ptolemy III Euergetes and completed in 57 BC under Ptolemy XII Auletes. It was built on the site of an earlier, smaller temple also dedicated to Horus, although the previous structure was oriented east–west rather than north–south as in the present site.