Unique in Greece, the Rotunda is a cylindrical building from the early 4th century AD. The mosaics inside are really impressive. The Rotunda is a massive circular structure, built in 306 AD, with a masonry core. Through its long history, it has gone through multiple periods of use and modification as a polytheist temple, a Christian basilica, a Muslim mosque, and a Christian church once again. A minaret is preserved from its use as a mosque, and ancient remains are exposed on its southern side. Some Greek publications claim it is the oldest Christian church in the world. These days, the Rotunda is primarily an archaeological site, where you can see some remaining Christian mosaics and feel the weight of history.

Part of the Acropolis, the Odeon of Herodes Atticus is a stone Roman theatre. The structure was completed in 161 AD only to become a ruin a hundred years later. The amphitheatre went through a series of renovations throughout the centuries and now host a wide variety of cultural events. The venue is widely known by locals as simply Herodeon.

At the end of the Rilke path, you will find the Castello Vecchio (10th-11th century), which survives today as the ruins of a tower and an arch. The Castello Nuovo is today a group of buildings of different ages, with a central courtyard and surrounded by a beautiful park.