World Heritage Sites: Exploring the World's Greatest Places

The Taj Mahal is widely considered one of the world's most beautiful buildings and an enduring symbol of love. Learn about the builder of Taj, the Mughal emperor Shah Jahan, and his beloved wife Mumtaz Mahal, for whom it was built. Study the stunning features of this incredible funerary monument, as it serves as an architectural expression of the culture and politics of Shah Jahan's empire.

The Great Barrier Reef is one of the world's natural wonders, drawing travelers to its shimmering, multicolored coral reefs, teeming with fascinating marine life. Relive the dramatic discovery of the Reef in 1768, and learn about its complex, layered ecosystem, the largest structure ever built by living organisms. Witness the huge diversity of its wildlife and assess man-made dangers to the Reef.

The Mogao Grottoes are a series of nearly 500 caves, dug out of cliffs in the desert of northwestern China, containing one of the most dazzling collections of Buddhist art anywhere in the world. Learn how the caves were created and see the sublime statues and lush paintings within them. Also take account of the legendary depository of Buddhist literature and historical texts within Cave 17.

The citadel of Persepolis was the capital of the Achaemenid Empire for nearly 200 years. Take the measure of the vast empire of the builders of the complex, the kings Darius I and Xerxes. Explore the palace, taking in its Gate of All Nations, monumental stairways, and superb friezes. Sample some of the many inscriptions and texts found at the site.

The extraordinary moai, the colossal statues of Easter Island, are a testament to human innovation and resilience. Begin with the amazing story of how this exceedingly remote island was colonized by Polynesian seafarers and how they subsisted there. Study the building techniques of the great statues, how they were transported across the island, and what they mean within the island's culture.