This place isn't called Grand for nothing. It has approximately 4,000 shops and is the largest covered shopping complex in the world. It's divided into sections - gold stores in one area, carpet stores in another, leather, clothing, silver jewellery, etc. Prices aren't cheap but they have an outstanding selection of items to choose from. Even if you have no intention of buying anything, the Bazaar is one of Istanbul's "must see"s.
Other than Kusadasi, the salespeople here were some of the most persistent we met but most were fine with a firm "no thanks".
The architecture of the Bazaar is really interesting - the outside reminded me of a mosque, without the minarets. Inside, some of the sections in the middle were built in the 15th century and the colors and designs on the walls and ceilings were breathtaking.
As well as stores, there are a number of restaurants and small stands where you can get a snack or a cup of tea (chai) and if you're lucky enough to find an empty table, you can rest up for your visit to the next section of shops.
It's easy to get lost in the Bazaar and we never managed to go out the same door we'd gone in but that just helped us to explore the areas around the Bazaar.
As well as the shops inside, enterprising vendors set up stalls or tables outside and sell everything from leather to housewares. Although prices were cheaper than inside, we still found it more expensive than the Spice Bazaar or other, less touristed areas of Istanbul.
Within easy walking distance of the Bazaar, you'll find Istanbul University and Beyazit Camii, the oldest standing mosque in Istanbul.
The Grand Bazaar is about 15 minutes on foot from many of the major sights like the Blue Mosque and Ayasofya. A tram line runs nearby so it's easy to get to and from most points in Istanbul.