With a layover of over 7 hours in Abu Dhabi, it's worth leaving the airport to explore the emirate's iconic landmarks. Sheikh Zayed Grand Mosque is around 15 minutes from the airport and open to all visitors. Entry is free, but you are required to dress modestly. From there, it's 20 minutes to Saadiyat Island, home to Louvre Abu Dhabi and Natural History Museum. Finish at Mamsha Al Saadiyat, where waterfront restaurants make for a quick, delicious meal before your next flight.