Yes, the iPod’s AC adapter supports a wide range of voltages. Read the AppleCare Knowledge Base document #60939 for more information. Please see the World Electric Guide for more info on a specific country’s power system standards.
However, depending on the physical outlet configuration in use in the country you will be visiting, you may need a plug adapter. You can order a World Travel Kit Adapter from the Apple Store or one of the AC travel adaptors like the Capdase USB Power Adaptor.