People visit the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan, on March 18, 2026. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)

This photo taken on March 18, 2026 shows the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)

This photo taken on March 18, 2026 shows the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)

This photo taken on March 18, 2026 shows the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)

This stitched panoramic photo taken on March 18, 2026 shows the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)

This photo taken on March 18, 2026 shows the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)

This photo taken on March 18, 2026 shows the Old Nisa, part of the Parthian Fortresses of Nisa, on the outskirts of Ashgabat, Turkmenistan. The Parthian Fortresses of Nisa consist of two tells of Old and New Nisa, indicating the site of one of the earliest and most important cities of the Parthian Empire, a major power from the mid 3rd century BC to the 3rd century AD. In 2007, the Parthian Fortresses of Nisa was inscribed on the World Heritage List as a cultural site. (Xinhua/Li Renzi)