Many lists of wonders of the world are said to have existed during the Middle Ages, although it is unlikely that these lists originated at that time because the word medieval was not even invented until the Enlightenment-era, and the concept of a Middle Age did not become popular until the 16th century. Brewer's refers to them as "later list[s]" suggesting the lists were created after the Middle Ages.
Many of the structures on these lists were built much earlier than the Medieval Ages, but were well known. These lists go by names such as Wonders of the Middle Ages (implying no specific limitation to seven), Seven Wonders of the Middle Ages, Medieval Mind and Architectural Wonders of the Middle Ages.
Typically representative are:
Stonehenge
Colosseum
Catacombs of Kom el Shoqafa
Great Wall of China
Porcelain Tower of Nanjing
Hagia Sophia
Leaning Tower of Pisa
Other sites sometimes included on such lists:
Taj Mahal
Cairo Citadel
Ely Cathedral
Cluny Abbey
Wonders of the modern world:
Many lists have been made of the greatest structures built during modern times or of the greatest wonders existing today. Some of the most notable lists are presented below.
American Society of Civil Engineers:
The American Society of Civil Engineers compiled a list of wonders of the modern world:
Wonder
Date Started
Date Finished
Location
Channel Tunnel
December 1, 1987
May 6, 1994
Strait of Dover, between the United Kingdom and France
CN Tower
February 6, 1973
June 26, 1976, tallest freestanding structure in the world 1976–2007.
Toronto, Ontario, Canada
Empire State Building
January 22, 1930
May 1, 1931, Tallest structure in the world 1931–1967. First building with 100+ stories.
New York, NY, U.S.
Golden Gate Bridge
January 5, 1933
May 27, 1937
Golden Gate Strait, north of San Francisco, California, U.S.
Itaipu Dam
January 1970
May 5, 1984
Paraná River, between Brazil and Paraguay
Delta Works/ Zuiderzee