The Forgotten Hill Fortress of Pamphylia

Hidden on a steep limestone hill between Aspendos and Perge, Sillyon Ancient City is one of Pamphylia’s most defensively positioned and least-visited ancient settlements. Located about 15 km from Serik, this former fortress-city rises above the plains near today’s Yanköy, known locally as Yanköy Hisarı or Asar Köy.

Sillyon was founded on Koçhisar Hill, a naturally fortified plateau whose sheer cliffs made extensive city walls unnecessary. Only the western and southwestern approaches—where the slope is gentler—were reinforced with carefully crafted fortification walls, towers, and bastions. These structures reflect advanced stonework and military engineering, marking Sillyon as one of the wealthiest and most strategically important strongholds of its time.

The city began minting its own coins in the 3rd century BCE, a strong indicator of political and economic autonomy. In Roman sources, the name appears as Sylviys, while during the Byzantine era Sillyon served as a bishopric center. Remarkably, the site also continued to be used during the Seljuk period, evidenced by a small mosque built within the ancient settlement.

Walking through Sillyon today feels less like visiting a classical city and more like discovering a forgotten citadel. The remains are spread along the hillside, culminating in an acropolis encircled by Hellenistic-period walls on the western summit. From the main gate, ancient paths lead upward to residential ruins, narrow streets, cisterns, and religious structures, including a Byzantine church and a Seljuk mosque standing side by side.

Below the southwestern slope lies an 8,000-seat theater and an adjacent odeon, partially carved into the terrain. From here, sweeping views stretch across the Pamphylian plain toward the Mediterranean—an evocative reminder of why this site was once considered nearly impregnable.

Sillyon is not a polished archaeological park. There are no ticket booths, no crowds, and very little signage. Instead, it offers something rarer: silence, scale, and the feeling of standing inside layers of uninterrupted history.

How to Get There

Sillyon is located near Yanköy, approximately 15 km north of Serik and about 45 km east of Antalya city center.

• By car: Drive from Antalya toward Serik, then follow local roads to Yanköy. The final section requires walking uphill.

• Public transport: Buses to Serik are frequent, but reaching the site from Serik requires a taxi or private transfer.

What’s Nearby (Internal & External Linking Friendly)

• Aspendos Ancient Theatre – one of the best-preserved Roman theaters in the world

• Perge Ancient City – a major Roman city with monumental streets

• Serik town center – local restaurants and services

• Belek coastline – beaches, resorts, and golf courses

Best Time to Visit

The best time to visit Sillyon Ancient City is spring (March–May) and autumn (September–November), when temperatures are mild and the surrounding Pamphylian plain is at its most scenic.

Summer months can be very hot, especially due to the steep uphill walk and lack of shade on the hilltop, making early morning visits essential. Winter is generally quiet and atmospheric, but rain may make paths slippery and access more challenging.

For photography, late afternoon offers dramatic light and panoramic views over the plains toward the Mediterranean.