My choice, The Great Pyramid of Giza.
Though there would be some arguing wether or not this amazing superstructure is made by humans, I would like to think that it is. And I think we deserve recognition for building something like this.
It has inspired us thousands of years after being built.
Created some of our most known mysteries and been a place for both relaxation and adventure.
The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact. Egyptologists believe that the pyramid was built as a tomb for fourth dynasty Egyptian Pharaoh Khufu (Cheops in Greek) over a 10 to 20-year period concluding around 2560 BCE. Initially at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for over 3,800 years. Originally, the Great Pyramid was covered by casing stones that formed a smooth outer surface; what is seen today is the underlying core structure. Some of the casing stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories about the Great Pyramid's construction techniques.
Architecture / Public space.
My choice, The Louvre.
A public space which is beautiful both inside and out, this is one of the most amazing places on Earth.
Architecture at its finest and filled with some of the greatest treasures of this planet.
The Musée du Louvre (French pronunciation: [myze dy luvʁ])—in English, the Louvre Museum or simply The Louvre—is one of the world's largest museums, and a historic monument. A central landmark of Paris, France, it is located on the Right Bank of the Seine in the 1st arrondissement (district). Nearly 35,000 objects from prehistory to the 19th century are exhibited over an area of 60,600 square metres (652,300 square feet). With more than 8 million visitors each year, the Louvre is the world's most visited museum.
Art / Sculpture.
My choice, Ai Weiwei´s Sunflower Seeds.
Due to the pure size and mass in combination with the factor of involvement from the observers and how it changes the space of the room, I am not totally sure if I should put this down as a sculpture or more appropriate, an installment, but non the less, I will have this as my contribution for the above mentioned category.
In October 2010, Sunflower Seeds was installed at the Tate Modern Turbine Hall, London. The work consists of one hundred million porcelain "seeds," each individually hand-painted in the town of Jingdezhen by 1,600 Chinese artisans, and scattered over a large area of the exhibition hall. The artist was keen for visitors to walk across and roll in the work to experience and contemplate the essence of his comment on mass consumption, Chinese industry, famine and collective work. However, on 16 October, Tate Modern stopped people from walking on the exhibit due to health liability concerns over the porcelain dust. In February 2011, a 220-pound (100 kg) pile from Sunflower Seeds sold for $559,394 (well above its high estimate of $195,000) at Sotheby's in London. In May 2012, Tate Modern acquired 8 million of Ai's "Sunflower Seeds" with support from the Art Fund, although the figure was not disclosed.