Civilization IV has 41 World Wonders (including the seven religious shrines) and 14 National Wonders. Like in Civ3, World Wonders may be built by only one civilization and National Wonders (also known as small wonders) may be built by every civilization. The effects of small wonders are usually more city-specific and you can build at most two small wonders per city. There is no restriction on the number of World Wonders you can build in a city. Each time you finish building a World Wonder, there is a short movie clip showing the wonder being built.
Civilization IV also introduced a new class of buildings called Projects. A few examples are the Apollo Program and The Internet. The main difference between projects and wonders is that projects cannot be rushed in any way, while wonders can be rushed (by forest chopping, gold, etc). Projects are classified into World Projects and Team Projects.
National Wonders (14):
NOTE: Most national wonders require several of a certain city improvement. For example, in order to build Globe Theatre on a standard size map, you need to have built 6 theatres. The bigger the map size, the higher the number required. All of the following numbers below assume a standard size map at normal game speed. The information is accurate as of Beyond the Sword, version 3.13.
| Graphic | National Wonder | Effects |
|---|---|---|
 |
Forbidden Palace
Cost: 200 |
Reduces maintenance in nearby cities City more likely to generate Great Spy |
 |
Globe Theatre
Cost: 300 |
No City more likely to generate Great Artist |
 |
Hermitage
Cost: 300 (Double Production Speed w/ Marble) |
+100% culture in this city City more likely to generate Great Artist |
 |
Heroic Epic
Cost: 200 (Double Production Speed w/ Marble) |
+100% military unit production in this city City more likely to generate Great Artist |
 |
Ironworks
Cost: 700 |
+50% hammers with Coal City more likely to generate Great Engineer |
 |
Moai Statues
Cost: 250 (Double Production Speed w/ Stone) |
+1 hammer on water tiles in this city City more likely to generate Great Prophet |
 |
Mt. Rushmore
Cost: 500 (Double Production Speed w/ Stone) |
-25% War City more likely to generate Great Artist |
 |
National Epic
Cost: 250 (Double Production Speed w/ Marble) |
+100% Great People birth rate in this city City more likely to generate Great Artist |
 |
National Park
Cost: 300 |
No unhealthiness in this city from population Removes access to coal for this city +1 free specialist for each forest preserve in this city’s tiles City more likely to generate Great Scientist |
 |
Oxford University
Cost: 400 (Double Production Speed w/ Stone) |
+100% research in this city City more likely to generate Great Scientist |
 |
Palace
Cost: 160 |
Makes this city the capital |
 |
Red Cross
Cost: 600 |
Free Medic I promotion for units built in this city City more likely to generate Great Scientist |
 |
Wall Street
Cost: 600 |
+100% gold in this city Can turn 3 citizens into Merchant |
 |
West Point
Cost: 800 (Double Production Speed w/ Stone) |
New units receive +4 experience points City more likely to generate Great Spy |
from this city. 
Related Links:
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More info about Wonders of the World is available in the Civilization IV Info Center.