Travel advisories

U.S. Customs Service alerts (provides guidelines for what travelers can/can't bring in/out of the U.S.)

Traveler's Health: Check for required/suggested immunizations and health warnings

High-altitude acclimatization and illness info

Passport and Visa Requirements

Entry requirements for foreign countries

Visa Service

EMBASSIES AND TOURIST OFFICES

Tourism offices worldwide (including tourist office websites)

Embassies around the world

WORLDWIDE CONVERSIONS: Electricity, money, metric measurements and time 

International Currencies Exchange Rates

Create a currency conversion "cheat sheet" to take along on your next trip

World electricity guide

Metric conversion calculator

Metric measurement calculator, including temperature conversions

World Clock

Current time anywhere in the world

INTERNATIONAL WEATHER INFORMATION

National Oceanic Atmospheric Administration (NOAA) Weather Report

International Weather Information
  
Weather forecasts around the world

ATM MACHINE LOCATIIONS AROUND THE WORLD

Find ATM locations for cards using Visa and Plus systems

ATM locations for cards using Master Card, Maestro and Cirrus   systems

MISCELLANEOUS

Info on airport facilities, terminals and parking around the world

Maps of locations worldwide (including driving directions for European destinations)

International dialing codes

UNESCO World Heritage Sites list 

Internet café locations worldwide

Listing of festivals around the world

Africa Information

National Sierra Club