One of the wealthiest of the Arabian Peninsula’s emirates, Abu Dhabi has an airport that rivals nearby Dubai in terms of overall opulence and over-the-top features. The highlights go beyond the duty-free shopping and first-class lounges (two of which offer walk-up admission for economy-class passengers). Free Wi-Fi is available throughout, and there are computer kiosks where you can access the Internet for free. The real star here is the architecture. The curves and arched lines, which let in natural light in without exposing passengers to the brutal heat, make this airport's main terminal seem almost space-age. A large indoor park with Mediterranean plant life offers refuge for laid-over fliers, along with more shopping options than some of the United Arab Emirates' largest malls.