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Istanbul, Turkey - It was the capital of the Roman/Byzantine Empire, and later of the Ottoman Empire.

Tokyo, Japan - Originally a small fishing village, Edo became the center of Tokugawa shogunate power in the early 17th century.

Beijing, China - It has been the capital of China for much of the country's recent history and was where the Ming and Qing dynasties were headquartered.

Mexico City, Mexico - The capital of the Aztec Empire and known for its complex canal system and large pyramids.

Angkor Region near Siem Reap, Cambodia - The capital city of the Khmer Empire, famous for its temples including Angkor Wat.

Current name is still Baghdad, Iraq - It was the center of the Islamic Golden Age under the Abbasid Caliphate.

Phra Nakhon Si Ayutthaya, Thailand - A Siamese kingdom that existed from 1351 to 1767 and was known for its trade and wealth.

Huế, Vietnam - It was the imperial capital of the Nguyen dynasty and is renowned for its historic monuments.

Near modern-day Baghdad, Iraq - It was the capital city of the Parthian and later the Sassanian Empires.

Still Samarra, Iraq - The site of a powerful Islamic capital city during the reign of the Abbasid Caliphate.

A suburb of Colombo, Sri Lanka - It is the current legislative capital while Colombo is the executive and judicial capital.

Gyeongju, South Korea - Was the capital of the Silla kingdom and is known for its extensive historical remains.

Still Lhasa, Tibet, China - Historically the capital of Tibet and once the seat of the Dalai Lama.

Still Hanoi, Vietnam - It has been the capital of Vietnam for over a thousand years and was referred to as Thang Long under the Ly Dynasty.