Maku is a town in northwestern Iran, some 22 km from the Turkish border crossing at Bazargan. It is a useful overnight stop if you are crossing to or from Doğubayazıt in Turkey, and it is also the gateway to one of the most remarkable religious monuments in the Middle East.
The town is set in a spectacular mountain gorge, the cliffs rising steeply on both sides of the Zangmar River. The Maku Fortress, carved into the basalt overhang above the town, is worth climbing to for the views and for its unexpected connection to the origins of the Baha'i faith — the Bab, the religion's founding prophet, was imprisoned here for nine months in 1848. The Maku Palace, a 19th-century Qajar-era building in the town centre, is a quieter stop.
About 20 kilometres south of town, the Monastery of Saint Thaddeus (Qara Kelisa) is a UNESCO World Heritage Site and one of the oldest continuously venerated Christian sites in the world. Built in striking black basalt and white marble, it draws Armenian pilgrims from across the diaspora each July and is worth making the journey for even if you are not religious. Be careful hiking in the hills near the border — this is a sensitive frontier zone and straying inadvertently into Turkey or Azerbaijan would create serious complications.