Saint Petersburg is home to one of the largest science museums in the world.
Saint Petersburg has the second-largest construction industry in Russia, including commercial, housing, and road construction
=== Administrative divisions ===== Economy ==Saint Petersburg is a major trade gateway, serving as the financial and industrial centre of Russia, with specializations in oil and gas trade; shipbuilding yards; aerospace industry; technology, including radio, electronics, software, and computers; machine building, heavy machinery and transport, including tanks and other military equipment; mining; instrument manufacture; ferrous and nonferrous metallurgy (production of aluminium alloys); chemicals, pharmaceuticals, and medical equipment; publishing and printing; food and catering; wholesale and retail; textile and apparel industries; and many other businesses

