Istanbul is a beautiful city with so much to see and do. Here's an ideal itinerary for 3 days in Istanbul:

Day 1:

Start your day by visiting the iconic Hagia Sophia, which was once a church, then a mosque, and now a museum. You'll be amazed by its stunning architecture and history. After that, head over to the Blue Mosque, which is just across the street from Hagia Sophia. This mosque is known for its beautiful blue tiles and six minarets.

For lunch, try some traditional Turkish food at one of the many restaurants in the Sultanahmet area. After lunch, take a stroll through the Grand Bazaar, one of the largest and oldest covered markets in the world. You can find everything from spices to jewelry to textiles here.

In the evening, head over to the Galata Tower, where you can enjoy panoramic views of the city while sipping on some Turkish tea or coffee. End your day with a delicious dinner at one of the many restaurants in the trendy Karakoy neighborhood.

Day 2:

Start your day by taking a ferry ride along the Bosphorus Strait, which separates Europe and Asia. You'll get to see some of Istanbul's most famous landmarks, such as the Maiden's Tower and the Dolmabahce Palace. Once you reach the Asian side, explore the Kadikoy neighborhood, which is known for its vibrant street art and local markets.

For lunch, try some delicious seafood at one of the many restaurants along the Bosphorus. After lunch, visit the Topkapi Palace, which was once the residence of Ottoman sultans. You'll get to see some incredible artifacts, including the famous Topkapi Dagger.

In the evening, head over to the Ortakoy neighborhood, which is known for its lively atmosphere and street performers. Grab a bite to eat at one of the many street food vendors and enjoy the beautiful views of the Bosphorus.

Day 3:

Start your day by visiting the Basilica Cistern, an underground water reservoir that was built in the 6th century. You'll be amazed by its stunning architecture and the Medusa heads that are used as column bases.

For lunch, try some delicious Turkish kebabs at one of the many restaurants in the Taksim Square area. After lunch, visit the Istanbul Modern Museum, which showcases contemporary Turkish art.

In the evening, head over to the Beyoglu neighborhood, which is known for its vibrant nightlife. Take a stroll down Istiklal Street, which is lined with shops, cafes, and bars. End your day with a delicious dinner at one of the many rooftop restaurants in the area, where you can enjoy stunning views of the city.