Entered from a gated courtyard, the rebuilt 1618 Koski Mehmed Paša Mosque lacks a certain finesse in its interior, but you can climb the claustrophobic minaret for sweeping town views.
The most attractive part of the mosque complex is the small courtyard outside with its fountain taps, tea-stall and garden area. Access to that doesn't require a ticket unless you want to get close to the parapet for the river view.