Best Photos of the Day

Conservation workers' stand along the scaffolding at the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), at the ancient site of Ctesiphon near moden al-Madain in central Iraq, on November 24, 2021. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

A man walks at the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), stands before the conservators' scaffolding at the ancient site of Ctesiphon near moden al-Madain in central Iraq, on November 24, 2021. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

This picture taken on November 24, 2021 shows a close-up view of the masonry of the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), stands before the conservators' scaffolding at the ancient site of Ctesiphon near moden al-Madain in central Iraq. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

Conservation workers' stand along the scaffolding at the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), at the ancient site of Ctesiphon near moden al-Madain in central Iraq, on November 24, 2021. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

Hassan Nazim (R), Iraq's Minister of Culture, Tourism, and Antiquities, is toured by conservators working at the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), at the ancient site of Ctesiphon near moden al-Madain in central Iraq, on November 24, 2021. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

Conservation workers' stand along the scaffolding at the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), at the ancient site of Ctesiphon near moden al-Madain in central Iraq, on November 24, 2021. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

Birds fly over the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), at the ancient site of Ctesiphon near moden al-Madain in central Iraq, on November 24, 2021. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

This picture taken on November 24, 2021 shows a view of the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), stands before the conservators' scaffolding at the ancient site of Ctesiphon near moden al-Madain in central Iraq. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.

This picture taken on November 24, 2021 shows a lateral view of the Arch of Ctesiphon, also known as Taq Kisra (Khosrow's Arch), stands before the conservators' scaffolding at the ancient site of Ctesiphon near moden al-Madain in central Iraq. The archaeological site, which houses the remnants of the former capital of the Persian Sassanid Empire until the Muslim Arab conquest in the 7th century AD, is currently undergoing restoration works to conserve the 1400-year-old arch. The structure is "the largest single-span vault of unreinforced brickwork in the world". Sabah ARAR / AFP.