The massive Sheikh Zayed Grand Mosque Abu Dhabi's most popular landmark by far – a sprawling work of construction that's accentuated by a myriad of intricate designs. In many ways, the mosque is meant to be an architectural fusion of various Islamic architectural styles including Mameluke, Ottoman, and Fatimid design elements. Once you venture inside, you'll witness elaborate glass-work, stunning mosaic tiling and spectacular carvings – it is truly a sight to behold. Non-Muslims are free to explore all areas of the mosque and there are even guided tours available, so don't fail to take advantage of this opportunity.