The Acropolis of Athens
"The Acropolis of Athens is the best known acropolis (high city, The "Sacred Rock") in the world. Although there are many other acropoleis in Greece, the significance of the Acropolis is such that it is commonly known as The Acropolis without qualification."
http://en.wikipedia.org/wiki/Acropolis_of_AthensThe Eiffel Tower
"It is the tallest structure in Paris and one of the most recognized monuments in the world. Named after its designer, engineer Gustave Eiffel, it is the most visited monument in the world;.."
http://en.wikipedia.org/wiki/Eiffel_TowerThe Colosseum
"The Colosseum or Coliseum, originally the Flavian Amphitheatre.., is a giant amphitheatre in the centre of the city of Rome, Italy. Originally capable of seating around 50,000 spectators, it was used for gladiatorial contests and public spectacles. It was built on a site just east of the Roman Forum, with construction starting between 70 and 72 AD under the emperor Vespasian."
http://en.wikipedia.org/wiki/ColosseumMusee du Louvre
"The Louvre Museum.. in Paris, France, is the most visited and one of the oldest, largest, and most famous art galleries and museums in the world. The Louvre has a long history of artistic and historic conservation, inaugurated in the Capetian dynasty until today. The building was previously a royal palace and is famous for holding several of the world's most beautiful works of art, such as Leonardo da Vinci's Mona Lisa, The Virgin and Child with St. Anne, Madonna of the Rocks, and Alexandros of Antioch's Venus de Milo."
http://en.wikipedia.org/wiki/Musee_du_LouvreFontana di Trevi
"The fountain at the juncture of three roads.. marks the terminal point of the Aqua Virgo.., one of the ancient aqueducts that supplied water to Rome. In 19 BC, supposedly with the help of a virgin, Roman technicians located a source of pure water some 13 km (8 miles) from the city. (This scene is presented on the present fountain's facade)."
http://en.wikipedia.org/wiki/Fontana_di_TreviTower of London
"The Tower's primary function was a fortress, a royal palace, and a prison (particularly for high status and royal prisoners, such as the Princes in the Tower and the future Queen Elizabeth I). This last use has led to the phrase "sent to the Tower" (meaning "imprisoned"). It has also served as a place of execution and torture, an armoury, a treasury, a zoo, a mint, a public records office, an observatory, and since 1303, the home of the Crown Jewels of the United Kingdom."
http://en.wikipedia.org/wiki/Tower_of_LondonLeaning Tower of Pisa
"The Tower of Pisa was a work of art, performed in three stages over a period of about 174 years. Construction of the first floor of the white marble campanile began on August 9, 1173, a period of military success and prosperity. This first floor is surrounded by pillars with classical capitals, leaning against blind arches."
http://en.wikipedia.org/wiki/Leaning_tower_of_Pisa