The ruins of Anadolu castle are on top of the hill town that has the same name. To get here take one of the ferries that cross the Bosphorus to the last stop, then it's a simple 15 minute walk and reach the top of the hill. The castle itself is nothing special, but its setting is. It's almost just beyond the Bosphorus where the Black Sea begins, is full of greenery and is perfect for snacking or napping. Although the building is not well maintained, you can access within and see the fun "phrases" that travelers from around the world have written on their walls over the years.
Bodrum Castle dates from the Middle Ages and was one of the first bulwarks against advances of the Ottoman Empire. It was held for several centuries until the Knights of St. John, under attack by the Turkish Army, were forced to retreat to the nearby island of Kos and later to Malta. It's an extremely well-preserved and beautiful medieval fortress which you can visit for a small fee.
It is situated in the southern section of the wall of Theodosius, near the Sea of Marmara. Its seven towers are connected by thick walls that make up a pentagonal fortress. It became one of the gates of the fortress when Theodosius II added the new walls. The Turks built another bastion after the conquest and gave it the name "Yedikule". The Ottoman treasury was kept in this fort for a short time but later it served as a prison for political prisoners.
Amasya Castle is in a great place, at the top of the mountain that guards the city and the rock-cut tombs of the kings of Pontus. To get to this citadel you have to take a path from Amasya indicating "Kale". This is a 2km road that can be done by car or on foot. Within 2 miles there is a car park, and you can not go higher with any other and from there we have to walk another 20 minutes to get to the top. It is a steep but easy, it is advisable to have water in summer because the sun is strong. The citadel is above the cliffs and there are breathtaking views, as well as being able contamplar spectacular scenery, are also perfectly both Pontic tombs and the beautiful city of Amasya. What remains of this citadel is quite little, specifically we can see the remains of a wall that was built in the time Póntica and the castle, which was also built at the time and was subsequently restored Pontic first by the Ottomans and finally in 1980. One of the things that attract the attention of the fort is an old cannon on a ledge there and apparently fires every year during Ramadan to advise that ended the daily fast. Indeed, it is quite possible to find on top of Amasya young people, because they love being in this place. They tend to be very hospitable and friendly and, although some do not speak English very well, they are willing to strike up a conversation with tourists.