It is a historic fortified town with a hostel (caravanserai) and a hamam beneath. He designed a caravanserai in Eregli and an octagonal madrasah in Constantinople. Along the major trade routes, bazaars were associated with the caravanserai. The preserved madrassas include buildings erected as caravanserai. Trade from Iran and Central Asia across Anatolia was developed by a system of caravanserai. The construction of these caravanserai inns improved in scale, fortification, and replicability. It dates back to 1385, when Amir Jarkas el-Khalili built a large caravanserai, or khan. In Kerman, traders of Hindu background had a caravanserai. The word "serai" is sometimes used with the implication of caravanserai. The Persian caravanserai was built as a large road station, outside of towns. Due to lack of state funds, the "caravanserai" is abandoned and falls into disuse. It is opposite to the Bukhara Caravanserai. For a long time it was also used as a caravanserai or "khan". Instead, he settled in Tehran's Reza Khan Caravanserai, where he was particularly busy with athletics. The Great Caravanserai and Shaista Khan Caravanserai in Dhaka were centres of commercial activities.