The present standing building was constructed originally as a church between 532 and 537 on the orders of the Byzantine Emperor; therefore, it is also a singular testimony to the grandeur and the genius of Byzantine architecture. It is the former Greek Orthodox Christian patriarchal cathedral, later an Ottoman imperial mosque and now a museum in Istanbul, Turkey.

The Forbidden City is the world’s largest collection of well-preserved medieval wooden structures; every detail reflects features of traditional Chinese architecture and rich Chinese culture. It was constructed from 1406 and opened for public in 1420. The complex consists of 980 buildings and covers 72 hectares. Such structures give us an idea about the great architecture of the world.

It is a French château (a large French country house or castle, often giving its name to wine made in its neighbourhood) spanning the River Cher. The current château was built in 1514–1522 on the foundations of an old mill and was later extended to span the river. The bridge over the river was built in 1556-1559, on the basic designs of French Renaissance architecture.

It is originally known as the Fuller Building. It is a triangular 22-story, 285-foot (87 m) tall steel-framed landmark building. It was completed in 1902 and has been called one of the world’s most iconic skyscrapers of that time, being the tallest. As with numerous other wedge-shaped buildings in the neighbourhood, the name “Flatiron” derives from its resemblance to a cast-iron clothes iron. The Flatiron Building was designated a New York City landmark in 1966.

The Gateway Arch is a 630-foot monument and it is the world’s tallest arch.  It is Clad in stainless steel and built in the form of a weighted catenary arch. There was a design competition for this piece of work for 3 years 1945-48, though it was complete in 1965 and officially dedicated to “the American people.

It is a masterpiece designed by Frank Lloyd Wright and built in 1935. It is a famous modern architecture example, a house which is a fusion of the artificial and the natural in perfect harmony. This house is set above a natural waterfall and water is actually flowing through it. It was declared “best all-time work of American architecture” by the American Institute of Architects in the year 1991.

Burj al Arab is 321 meters high and it represents one of the wonders of contemporary engineering in today’s world, completed in 1999. It is built on an artificial island 280 meters away from the coast. It has a helipad near the roof at a height of 210 m (689 ft) above ground making it is one of the most luxurious and the fourth tallest hotel in the world.

Metropol Parasol is a wooden structure, some 90 feet high and nearly 500 feet long. The structure consists of six parasols (A parasol is an object like an umbrella that provides shade from the sun) in the form of giant mushrooms constructed in four levels. The wood used in the structure is birch, imported from Finland, because of its straight qualities and it was completed in 2011.

It is a nature park, created in 2012. Gardens by the Bay is Singapore’s plans to transform its “Garden City” to a “City in a Garden”, with the main aim of raising the quality of life by enhancing greenery all around and flora in the city. The park consists of three waterfront gardens: Bay South Garden, Bay East Garden and Bay Central Garden. Its flower Dome is the largest glass greenhouse in the world. It can be considered as one of top 10 coolest buildings in the world.