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Riyadh (Arabic: الرياض, romanized: ar-Riyāḍ, lit. 'The Gardens' [ar.riˈjaːdˤ] Najdi pronunciation: [er.rɪˈjɑːðˤ]) is the capital of Saudi Arabia and the largest city on the Arabian Peninsula. Located in the center of the an-Nafud desert, on the eastern part of the Najd plateau, the city sits at an average of 600 metres (2,000 ft) above sea level, and receives more than 16 million tourists each year, making it the 2nd most visited city in the Arab world. Riyadh had a population of 7.6 million people in 2019, making it the most populous city in Saudi Arabia, 2nd most populous in the Arab world (after Cairo), and 38th most populous in Asia.The first mentioning of the city by the name Riyadh was in 1590, by an early Arab chronicler. In 1737, Deham Ibn Dawwas, who was from the neighboring Manfuha, settled in and took control of the city. Deham built a wall around the city, and the best known source of the name Riyadh is from this period, thought to be referring to the earlier oasis towns that predated the wall built by Ibn Dawwas. In 1744, Muhammad ibn 'Abd al-Wahhab formed an alliance with the Emir of Dir'iyah, Muhammad bin Saud, and in 1774, they took Riyadh from Deham. However their state, now known as the First Saudi State, came to a collapse in 1818. Turki ibn Abdullah founded the Second Saudi State in the early 19th century and made Riyadh his capital in 1825. However, his reign over the city was disrupted by a joint Ottoman–Rashidi alliance. Finally, in the early 20th century, 'Abdulaziz ibn Saud, known in the west simply as Ibn Saud, retrieved his ancestral kingdom of Najd in 1902 and consolidated his rule by 1926 with the final Saudi conquest of Hejaz. After this he named his kingdom Saudi Arabia in September 1932 with Riyadh as the capital.Riyadh is the political and administrative centre of Saudi Arabia.
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Pittsburgh ( PITS-burg) is a city in the state of Pennsylvania in the United States, and is the county seat of Allegheny County. A population of about 300,286 (2019) residents live within the city limits, making it the 66th-largest city in the U.S. and the second-most populous city in Pennsylvania behind Philadelphia. The Pittsburgh metropolitan area is the anchor of Western Pennsylvania; its population of 2,324,743 is the largest in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania, and the 27th-largest in the U.S.
Pittsburgh is located in the southwest of the state, at the confluence of the Allegheny River and the Monongahela River, forming the Ohio River. Pittsburgh is known both as "the Steel City" for its more than 300 steel-related businesses and as the "City of Bridges" for its 446 bridges. The city features 30 skyscrapers, two inclined railways, a pre-revolutionary fortification and the Point State Park at the confluence of the rivers. The city developed as a vital link of the Atlantic coast and Midwest, as the mineral-rich Allegheny Mountains made the area coveted by the French and British empires, Virginians, Whiskey Rebels, and Civil War raiders.Aside from steel, Pittsburgh has led in the manufacturing of other important materials — aluminum and glass — and in the petroleum industry. Additionally, it is a leader in computing, electronics, and the automotive industry. For part of the 20th century, Pittsburgh was behind only New York City and Chicago in corporate headquarters employment; it had the most U.S. stockholders per capita. Deindustrialization in the 1970s and 80s laid off area blue-collar workers as steel and other heavy industries declined, and thousands of downtown white-collar workers also lost jobs when several Pittsburgh-based companies moved out.