The National Archaeological Museum (Bulgarian: Национален археологически музей, Natsionalen arheologicheski muzey) is an archaeological museum in the centre of Sofia, the capital of Bulgaria. It occupies the building of the largest and oldest former Ottoman mosque in the city, originally known as Koca Mahmut Paşa Camii. The construction started in 1451 under grand vizier Veli Mahmud Pasha but due to his death in 1474 the mosque was completed in 1494. The museum was established as a separate enti