This document summarizes NIFLAR's 3D virtual worlds created for language learning. It describes several virtual environments created in Second Life and OpenSimulator, including regions modeled after real-world locations and fantasy settings. These virtual worlds are designed to provide culturally authentic contexts and opportunities for social interaction to improve intercultural communication skills. A variety of pedagogical activities and games are incorporated to support language learning, such as treasure hunts, guided tours, problem-solving puzzles, and communicative games.