Launch of a spaceship into planet orbit. Astronauts return with pictures of the globe. Effect being whole map revealed
The city that built The Colossus will produce one extra trade arrow in each square that already produces one. Effects expire with discovery of Flight
Copernicus' Observatory will increase the science output of the city it is built in by 50%. Effects do not expire.
Cure for Cancer
The Cure for Cancer provides one extra happy citizen in each city. Effects do not expire
The Great Library
The Great Lighthouse
The Great Wall
Grants virtual City walls to every city of owners civ. Increasing defence.
Effect expires after discovery of Metallurgy
The Hanging Gardens
Isaac Newton's College
J.S. Bach's Cathedral
King Richard I's Crusade
The construction of Magellan's Expedition allows all of one's own naval vessels to move 2 more spaces than listed in their description.