A few year's ago accessing the rooftop of the 17th-century Büyük Valide Han in Eminönü was one of Istanbul's best kept secrets. Now word is out, it's becoming one of the most photographed views in the city. Tucked away in the backstreets behind the Spice Bazaar, its a location many travels fear to go - put off by the maze of streets that are easy to get lost in. The building itself is an old Ottoman inn that once accommodated traveling merchants. Whilst today it's a workplace for craftsmen, it was used to store Oriental and European wares traveling the Silk Road and Spice Routes. To access the rooftop you'll need to find the key-keeper and offer a small tip. He can usually be found on the first floor and show you the secret doorway to a magnificent view. Watch your step though, there is few safety railings in place - if at all. If you have mobility problems then it's best you stay at ground level.