The oldest attraction on the map of Kos is the Agora. In ancient Greece, this was the name of the market square, where all the major events in the life of the city took place. The Agora is located near the port, and you can still see its original outlines: three galleries that converge in the central square. There are even remnants of ancient streets, houses and temples around the Agora!
The most impressive artifact is the Roman House (popularly known as Villa Casa Romana). It was discovered not so long ago, after an earthquake in 1933 - archaeologists managed to dig up 26 rooms with mosaics, a fountain and even a pedestal engraved with "Apelixikakos" ("warding off evil spirits").
Hippocrates' Platanus - the description of this attraction of Kos is in all guidebooks. But in fact, the significance of this giant tree is quite questionable. According to legend, it is believed that it was under this plane tree that the famous physician Hippocrates practiced with his students (which, by the way, is almost 2500 years ago!). Of course, the sycamore tree is much younger, but you don't have to tell your Instagram followers about it! You can find the "philosophical" tree near the entrance to the Neratzia Castle.
Castle Neratzia is a representative of medieval culture on the Kos sightseeing map. It was built in the XV century by knights from the order of the Ioannites to protect the island from the Turks. Entrance to the fortress is paid (up to 5 EUR in "high season"), on weekends tourists are often let in for free. Please note: on some maps of Kos this attraction in Russian sounds like "Fortress of Ionite Knights".
About 4 kilometers from the city is the main attraction of the entire island of Kos - the ruins of the ancient temple of Asklepion, dedicated to the god of healing. It is difficult to recognize one of the greatest hospitals of antiquity on modern photos of this attraction of Kos! It was once a place where the sick were treated, the first medical textbooks were compiled and court doctors were trained - you can still take a dip in the spring once used for water procedures. You can get here from Kos by bus (1,20 EUR one-way) or mini steam train (leaves from the embankment every 60 minutes, ticket costs 5 EUR round trip). The museum is open from 8:00 to 15:00, admission costs 4 EUR, Monday is the day off.