1. Royal Pavilion at Brighton, John Nash, 1815

12. Expressionistic, fantastic, organic forms in undulating facade and roof line. light court

13. Spanish architect Antoni Gaudi defied rigid geometry when he designed Casa Mila Barcelona. Casa Mila Barcelona is an apartment building with a fanciful aura. Wavy walls seem to undulate and a comical array of chimney stacks dance across the roof. "The straight line belongs to men, the curved one to God," Gaudi asserted. The final secular design of the Spanish surrealist Antoni Gaudí, Casa Milà Barcelona is an apartment building with a fanciful aura. Wavy walls made of rough-chipped stone suggest fossilized ocean waves, while doors and windows look like they are dug out of sand. A comical array of chimney stacks dances across the roof.

14. The Schroder House, Utrecht Gerrit Rietveld architect, at Utrecht, The Netherlands, 1924 to 1925

17. Vladimir Tatlin, Monument to the Third International, 1919-20

21. 1928 Villa Savoye Le Corbusier He was convinced that the bold new industrial age required an equally audacious style of architecture. And who better to design it than him?

26. Fallingwater , by Frank Lloyd Wright , at Ohiopyle, (Bear Run), Pennsylvania, 1934 , 1938, 1948 Fallingwater may look like a loose pile of concrete slabs about to topple into the stream... but there is no danger of that! The slabs are actually anchored through the stonework of the hillside. Also, the largest and heaviest portion of the house is at the rear, not over the water. And, finally, each floor has its own support system. When you enter the recessed front door of Fallingwater, your eye is first drawn to a far corner, where a balcony overlooks the waterfall. To the right of the entryway, there is a dining alcove, a large fireplace, and stairs leading to the upper story. To the left, groups of seating offer scenic views.

28. Le Corbusier's United Nations Secretariat building over-looks the New York City skyline along the East River. International Style is a term often used to describe Bauhaus architecture in the United States. The name came from the book The International Style by historian and critic Henry-Russell Hitchcock and architect Philip Johnson. The book was published in 1932 in conjunction with an exhibition at the Museum of Modern Art in New York. The term is again used in a later book, International Architecture , by Walter Gropius. While German Bauhaus architecture had been concerned with the social aspects of design, America's International Style became a symbolism of Capitalism: The International Style is the favored architecture for office buildings, and is also found in upscale homes built for the rich. One of the most famous examples of the International Style is Le Corbusier's United Nations Secretariat building. The smooth glass slab dominates New York's skyline along the East River.

29. The Farnsworth House by Mies van der Rohe Hovering in a green landscape, the transparent glass Farnsworth House by Ludwig Mies van der Rohe is often celebrated as his most perfect expression of the International Style. The house is rectangular with eight steel columns set in two parallel rows. Suspended between columns are two steel-framed slabs (the ceiling and the roof) and a simple, glass-enclosed living space and porch. All the exterior walls are glass, and the interior is entirely open except for a wood paneled area containing two bathrooms, a kitchen and service facilities. The floors and exterior decks are Italian travertine limestone. The steel is sanded smooth and painted a gleaming white. The Farnsworth House took six years to design and build. During this period, Philip Johnson built his famous Glass House in New Canaan, Connecticut. However, Johnson's home is symmetrical, ground-hugging structure with a very different atmosphere. Edith Farnsworth was not happy with the house Ludwig Mies van der Rohe designed for her. She sued Mies van der Rohe, claiming that the house was not livable. Critics, however, said that Edith Farnsworth was lovesick and spiteful. 1946 - 51

30. Designed and built from 1946 to 1951, Farnsworth House is considered a paradigm of international style architecture in America. The house's structure consists of precast concrete floor and roof slabs supported by a carefully crafted steel skeleton frame of beams, girders and columns. The facade is made of single panes of glass spanning from floor to ceiling, fastened to the structural system by steel mullions. The building is heated by radiant coils set in the concrete floor; natural cross ventilation and the shade of nearby trees provide minimal cooling. Though it proved difficult to live in, the Farnsworth House's elegant simplicity is still regarded as an important accomplishment of the international style.

31. 1957 Park Avenue New York, New York, USA Ludwig Mies van der Rohe (and Philip Johnson), architects Ludwig Mies van der Rohe and Philip Johnson rejected "bourgeois" ornamentation when they designed the Seagram Building in New York City. A shimmering tower of glass and bronze, the Seagram Building is both classical and stark. Metallic beams emphasize the height of the 38-story skyscraper, while a base of granite pillars leads to horizontal bands of bronze plating and bronze-tinted glass.

33. The Chrysler Building in New York City was built in 1930. For a few months, this Art Deco skyscraper was the tallest structure in the world. It was also one of the first buildings composed of stainless steel over a large exposed surface. The architect, William Van Alen, drew inspiration from machine technology for the ornamental details on the Chrysler Building: There are eagle hood ornaments, hubcaps and abstract images of cars.

34. Philip Johnson's At&T Headquarters (now the SONY Building) is often cited as an example of postmodernism. Postmodern architecture evolved from the modernist movement, yet contradicts many of the modernist ideas. Combining new ideas with traditional forms, postmodernist buildings may startle, surprise, and even amuse. Familiar shapes and details are used in unexpected ways. Buildings may incorporate symbols to make a statement or simply to delight the viewer. Philip Johnson's At&T Headquarters is often cited as an example of postmodernism. Like many buildings in the International Style, the skyscraper has a sleek, classical facade. At the top, however, is an oversized "Chippendale" pediment.

37. Centre Pompidou in France by by Richard Rogers, Renzo Piano, and Gianfranco Franchini. High-tech buildings are often called machine-like. Steel, aluminium, and glass combine with brightly colored braces, girders, and beams. Many of the building parts are prefabricated in a factory and assembled later. The support beams, duct work, and other functional elements are placed on the exterior of the building, where they become the focus of attention. The interior spaces are open and adaptable for many uses. The High-tech Centre Pompidou in Paris appears to be turned inside out, revealing its inner workings on the exterior facade.

38. The Sydney Opera House, designed by Jørn Utzon, winner of the Pritzker Architecture Prize in 2003 Frank Lloyd Wright said that all architecture is organic, and the Art Nouveau architects of the early twentieth century incorporated curving, plant-like shapes into their designs. But in the later half of the twentieth century, Modernist architects took the concept of organic architecture to new heights. By using new forms of concrete and cantilever trusses, architects could create swooping arches without visible beams or pillars. Organic buildings are never linear or rigidly geometric. Instead, wavy lines and curved shapes suggest natural forms.