Mardin is an old city in Eastern Turkey known for its unique honey colored houses, monasteries, and mosques. The Hagia Sophia was first built as an important Christian church but is now a museum. Mount Ararat is the largest volcano in Turkey, located near the borders with Iran and Armenia. Istanbul, Turkey's largest city, holds over 9 million people and is a major cultural center. Ölüdeniz is a peaceful sheltered lagoon surrounded by mountains, ideal for travelers. Artvin has lush green land and mountains reaching 3900m, with lakes attracting visitors despite frequent rain.