
ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )

ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )

ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )

ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )

ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )

ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )

ISTANBUL, TURKEY - APRIL 25: A drone photo shows Rumelian Fortress (Rumeli Hisari) with Judas Tree (Cercis siliquastrum), known as a spring flower, in full bloom during spring season in Istanbul, Turkey on April 25, 2020. ( Muhammed Enes Yıldırım - Anadolu Agency )