Aydos Pine Forest & Aydos Castle: Istanbul's Hidden Hilltop Gem
A Cool, Free, and Quiet Escape Above Sultanbeyli — With a Byzantine Castle at the Top
A New Favorite After Many Visits to Istanbul
This stop was part of a longer trip that also took me through the UK, and it turned into one of the best surprises of the whole vacation. I've visited Istanbul many times, but this was my first time at Aydos Pine Forest and Aydos Castle — and it genuinely felt like a hidden gem. Istanbul has no shortage of famous attractions, but this hilltop forest and its castle ruins aren't nearly as well known, which is exactly what made the visit feel special.
Locally known as Aydos Kalesi, the castle sits on a hill above the town of Sultanbeyli, on Istanbul's Asian side, with the pine forest wrapped around the hillside beneath it.
Getting to the Top — A Free Ride Up the Hill
Aydos Castle sits on top of a hill — really a small mountain — overlooking the forest below, and the climb could easily be a deterrent. Instead, the local Sultanbeyli Municipality runs a free shuttle bus from the forest gate all the way up to the summit near the castle. It's a small touch that makes a big difference, especially in the heat, and it's one of the details that made the visit feel well looked after despite how under-the-radar the location is.
A Cool Escape from the Istanbul Heat
We visited on a day when Istanbul was in the middle of a heat wave, and the difference once we reached the forest was immediate — the pine cover and elevation kept the air noticeably cooler and more comfortable than down in the city. Near the castle there's a free park area with seating, shaded by trees, along with a small café that was clean and pleasant — a genuinely nice place to sit for a while before or after exploring the ruins.
Aydos Castle — A Piece of Byzantine History
Aydos Castle was built on a hill below Mount Aydos by the Byzantines, likely during the late 11th or 12th century. Wandering through the ruins adds a layer of history to what would otherwise be simply a scenic hike — it's a reminder that this hillside has been watching over the Anatolian side of the city for close to a thousand years.
The real highlight, though, is the view. From the top of the castle you get a sweeping view across the city — one of the better vantage points I've found in Istanbul, and well worth the trip for photos alone.
A Quick History Note
The castle dates to the Byzantine era, likely constructed in the late 11th or 12th century. Visiting it offers a small but genuine window into Istanbul's Byzantine past, well away from the more heavily visited historical sites in the city center.
Getting There
Aydos Pine Forest is more accessible than its "hidden gem" reputation might suggest, especially now.
Sabiha Gökçen Airport
Istanbul's Sabiha Gökçen Airport (SAW) is not far from the forest, making this a convenient stop if you're flying into or out of the Anatolian side of the city.
M5 Metro (Üsküdar–Sultanbeyli)
A metro station near AtlasPark Mall is not far from the forest either. It sits on the M5 line, which runs to Üsküdar on the Bosphorus — and this final stretch of the line only opened recently, so it's now easier than ever to reach the area by metro.
Is Aydos Forest Worth the Trip?
Bottom line: If you've already covered Istanbul's major landmarks and want a quieter, cooler, genuinely local spot — Aydos Pine Forest and Aydos Castle deliver on all counts. Free entry, a free shuttle to the summit, Byzantine history, and one of the best city views I've come across in Istanbul, all in a hilltop forest most visitors never hear about.