Hashtag
1. Which of these structures was built by the emperor Hadrian in Rome and remains the world's largest unreinforced concrete dome?
2. The **Great Wall of China** was primarily built for what purpose?
3. The **Mughal Empire**, which ruled much of the Indian subcontinent, is known for its blend of Persian, Islamic, and Indian culture. The **Taj Mahal** is a prime example of their architectural style, known as?
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