1: World Heritage Day, a celebration of architectural wonders around the globe.

2: Taj Mahal, India's iconic monument of love and UNESCO World Heritage Site.

3: Machu Picchu, ancient Incan citadel nestled in the Andes mountains of Peru.

4: The Great Wall of China, a marvel of ancient engineering and UNESCO World Heritage Site.

5: Petra, ancient city carved into the rock cliffs of Jordan's desert landscape.

6: Colosseum, Rome's iconic amphitheater and symbol of ancient Roman civilization.

7: Angkor Wat, Cambodia's stunning temple complex dedicated to the Hindu god Vishnu.

8: Chichen Itza, Mayan pyramid and archaeological site in Mexico's Yucatán Peninsula.

9: Pyramids of Giza, Egypt's ancient burial ground and one of the Seven Wonders of the World.

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