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Photo: Klaus-Peter Simon, CC BY-SA 3.0 via Wikimedia Commons
The Romans conquered Anatolia in the Mithridatic Wars of 88-63 BC, and created the province of Galatea with Ancyra as its capital. From 25 BC they built over what had been a Phyrigian temple to make an "Augusteum" for the worship of their emperor Octavian or Augustus (an outstanding ruler, a contrast to his successor, the dark and dissipated Tiberius). In the 5th century it was converted into a church by the Byzantines. Only the side walls and ornate doorway remain.
The Temple of Augustus and Rome is an augusteum located in the Altındağ district of Ankara. It is thought to have been built around 25–20 BC. Besides being one of the most important Roman-period ruins in the city, it is also known for the Monumentum Ancyranum. This is an inscription about the works of Augustus, who was considered the first Roman emperor. It is the most complete copy of Res Gestae Divi Augusti that has survived to the present day, even as the original in Rome had disappeared.
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Hacı Bayram Veli Cami
This was built in 1428, restored by Mimar Sinan in the 16th century, and with Kütahya tiles added in the 18th. Hacı Bayram Veli (1352–1430) was a poet and Sufi teacher, and his ornate tomb is a pilgrimage site.
Scrappy remains of the stage and backstage, they haven't restored the seating. Statues from the site are in the Museum of Anatolian Civilisations.
Roma Hamami
Ruins of a large Roman bath complex, built under Emperor Caracalla circa 200 AD and in use for 500 years. They follow the classical design of frigidarium (cold room), tepidarium (warm room) and caldarium (hot room), and their relative sizes show that Ancyra had winters as chilly then as now - those coins that fixed the dates were obviously not paid out to get even colder.
Anadolu Medeniyetleri Müzesi
Excellent display ranging from prehistory to the proto-Greek and Roman eras.
This volcanic outcrop has probably been fortified since the dawn of mankind, but the earliest traces are from the Phrygians of 8th century BC. The castle was reinforced by the Galatians then the Romans. You stroll up through cobbled streets to the double walls and can climb one of the towers, with views of the sprawling city and distant mountains.