Airlines in the World Wide Web
Internet Travel Network's extensive directory of links to almost 500 airline Web sites worldwide.

CIA World Factbook
Very thorough "A to Z" guide provided by the CIA covering geographical, cultural, political and economic features of over 250 countries and regions.

Fodor's
Create your own customized travel guides for any of Fodor's 99 destinations worldwide.

Frommer's
Destination guides to 200 of the most popular tourist destinations.

Geographia
Travel, cultural, and geographical information on destinations in Africa, Asia, the Caribbean, Europe, and Latin America.

InfoHub
Comprehensive guide for tours in over 100 countries featuring activities in dozens of categories ranging from amusement parks to yoga.

National Geographic
Much more than a travel site, this site for the venerable magazine contains a wealth of information of interest to the traveler, including travel features and maps.

Travel Warnings & Consular Information Sheets
The US State Department provides a list of potential travel issues and warnings at this site. It includes information on many countries.