He conducted the first scientific based archaeological researches done by a Turkish team. His digs included sites as varied as the Commagene tomb-sanctuary in Nemrut Dağı in southeastern Anatolia (a top tourist's venue in Turkey and a UNESCO World Heritage Site today, within the Adıyaman Province), the Hekate sanctuary in Lagina in southwestern Anatolia (much less visited, and within the Muğla Province today), and Sidon in Lebanon. The sarcophagi he discovered in Sidon (including the one known as the Alexander Sarcophagus, although this sarcophagus is thought to contain the remains of either Abdalonymus, King of Sidon; or Mazaeus, a Persian noble who was also the governor of Babylon) are considered among the worldwide jewels of archaeological findings. To lodge these, he started building what is today the Istanbul Archaeology Museum in 1881. The museum officially opened in 1891 under his directorship.