Other buildings are: The Central Heating Plant (for heating 75 buildings), Paul P. Cret, architect; Bureau of Engraving and Printing, W. B. Olmstead, architect; Smithsonian Institution (begun in 1846), James Renwick, architect; National Museum Building, Hornblower & Marshall, architects; Freer Gallery of Art, Charles A. Platt, architect; Department of Agriculture Building, Rankin, Kellogg & Crane, architects; Department of Agriculture South Building, the Supervising Architect; Naval Observatory; State, War, and Navy Building, A. B. Mullett, supervising architect; Old Pension Office Building (General Accounting Office); Army War College, McKim, Mead & White, architects; Walter Reed Hospital; Naval Hospital; Public Library, Ackerman & Ross, architects; United States Bureau of Standards; National Zoological Park (large new buildings completed in 1937); National Gallery of Art (now under construction), John Russell Pope, architect. IMPORTANT BRIDGES OF WASHINGTON Arlington Memorial Bridge, McKim, Mead & White, architects; Calvert Street Bridge, Paul P. Cret, architect; Francis Scott Key Bridge, Nathan Wyeth, architect; Connecticut Avenue (Taft) Bridge, Edward P. Casey, architect, lions by R. Hinton Perry; Q Street Bridge, Glenn Brown and Bedford Brown, architects, A. Phimister Proctor, sculptor; Klingle Ford Bridge, Connecticut Avenue, Paul P. Cret, architect; New Chain Bridge, designed under supervision of Brig. Gen. Dan I. Sultan, former Engineer Commissioner of the District of Columbia; John Philip Sousa Bridge, Southeast, McKim, Mead & White, architects. CATHEDRAL OF ST. PETER AND ST. PAUL (WASHINGTON CATHEDRAL) The cathedral is situated on Mount St. Alban, in the northwestern part of the city, on a hill 400 feet in height, said to be the highest point in the District of Columbia, giving a superb view over the National Capital. The cathedral, also known as the National Cathedral, was designed by George F. Bodley, of London, and Henry Vaughn, of Boston. It is a typical fourteenth century Gothic edifice. The cornerstone was laid in 1907, and since then a large part of the cathedral has been completed. Its ultimate cost, it is estimated, will be $20,000,000. The central nave is about complete, the apse and north transept are finished as are also several of the chapels, such as the Bethlehem Chapel, the Norman Chapel, the Chapel of St. John, and the Chapel of St. Mary. There are costly stones in the building from many parts of the world, including a stone from Bethlehem, which formed the cornerstone. [Illustration: WASHINGTON CATHEDRAL] [Illustration: WASHINGTON CATHEDRAL] [Illustration: NATIONAL SHRINE OF THE IMMACULATE CONCEPTION] The building is constructed of limestone. The sculpture and beautifully stained glass windows form the principal decorations.