On par with the pyramids of Egypt and the Great Wall of China, Cambodia's massive, UNESCO-listed Angkor Archaeological Park deserves its rank at the top of many a world traveler's bucket list. Located just outside of Siem Reap—where most international visitors fly in—the 250-square-mile (400-square-kilometer) sandstone complex was constructed between the ninth and 15th centuries by successive ""god-kings"" of the Khmer Empire. There are dozens of accessible temples and structures to see, but for most visitors, a 2-day or 3-day tour hits the highlights without becoming overwhelming. At center stage is Angkor Wat, a masterpiece of Khmer architecture with a shimmering reflective pool at its feet and five lotus-shaped towers etching an imposing silhouette against the sky. Make sure to visit the fortified city ruins of Angkor Thom and stroll around Ta Prohm, where the ruins have become tangled in the roots of ancient strangler figs and kapok trees.