In the 17th century, Cossack raiding fleets from the north became a serious problem for Ottoman Istanbul. Operating in fast, shallow-draft vessels, Cossack forces from the Dnieper and Don rivers swept south through the Black Sea and into the Bosphorus itself on multiple occasions, terrorizing Bosphorus villages and threatening the capital. The Ottoman response included fortifying the upper strait, and a castle at Rumelikavağı was among the defensive installations established to monitor and resist these incursions. The castle ruins still exist, medieval stonework embedded in the hillside above the waterfront. They are not the kind of grand preserved fortress that draws tour buses; they are the kind of ruins that make a neighborhood more layered — fragments of a serious military purpose that the village has long since grown around and beyond.

The Russo-Turkish War of 1877–1878 brought another wave of transformation to the northern Bosphorus shore. As Russian forces advanced through the Balkans and the Ottoman empire ceded territory, a portion of the displaced people from Russian-occupied provinces made their way to Rumelikavağı and settled there in 1877. This kind of demographic layering — fishing families, fortress garrison descendants, war refugees — is characteristic of Bosphorus villages that served multiple functions over time. Well into the 20th century, much of Rumelikavağı remained a military restricted zone, closed to ordinary settlement and visitors until the 1960s. The ruins of churches, mosques, fountains, and hamams scattered through the neighborhood are physical evidence of those accumulated centuries.

North of the neighborhood, the Yavuz Sultan Selim Bridge spans the Bosphorus in a single graceful arc. When it opened in 2016, it became the third bridge linking Europe and Asia across the strait, and at the time of its opening it held the record as the world's widest suspension bridge. The bridge is named for Selim I, the Ottoman sultan who vastly expanded the empire's territory in the early 16th century. From Rumelikavağı's waterfront, the bridge is visible to the north, its twin towers rising above the forested hillsides on both shores. It is a dramatic addition to a view that already included historic fortress walls, the shimmer of the Bosphorus, and the Anatolian shore in the distance.

The ferry pier at the center of Rumelikavağı is where the neighborhood's daily life concentrates. Ferries from Istanbul connect the village to the city without requiring the drive through Sarıyer, and the pier is the social and logistical anchor of the waterfront. The fish restaurants that cluster around it serve the same Bosphorus catch that local fishermen have pursued for generations — turbot, bluefish, sea bass — alongside the tourists and day-trippers who make the ferry journey north for lunch. There is a pleasantly unhurried quality to a Bosphorus village that still receives its visitors by water. The strait is not just background scenery here. It is the reason the village exists, the route that brings its guests, and the source of what feeds them.