Taj Mahal - Agra, India - Height: 73 meters (including the central dome) - Completion Year: 1653 - Construction Cost: Estimated at 32 million rupees (equivalent to around $1 billion today)

Detail: The Taj Mahal is an architectural masterpiece and a symbol of eternal love, built by Emperor Shah Jahan in memory of his wife Mumtaz Mahal.

Interesting Fact: It changes color throughout the day, appearing pinkish in the morning, white during the day, and golden in the moonlight.