There are a few things worth having a look at here. An interest in Turkey's history will lead you to the Museum of Anatolian Civilisation and there are several other sites of interest. Check out the list below for some ideas.

Museums

• Museum of Anatolian Civilisation
• Museum of Ethnography
• Old Turkish House Museum
• Railway Museum
• Open Air Locomotive Museum
• Republic Museum
• War of Salvation Museum
• Painting and Sculpture Museum
• Presidential Mansion
• Anit Kabir (Ataturk's Mausoleum)

Archaeological Sites

• Hisar (Fortress)
• Column of Julian
• Temple of Augustus
• Roman Baths

Architectural Interest

• Aslanhane Camii - 13th Century Selcuk Mosque
• Haci Bayram Camii - 15th Mosque
• Ankara Opera House ???

Museum of Anatolian Civilisation

There is a strong argument in favour of visiting this collection of exhibits before traveling anywhere else in Turkey. If you find yourself in Ankara and you're in any way interested in the history of Asia Minor you should make your way here. The museum is housed in a charming building, a restored covered market dating from the 15th Century and is easily accessible from the centre of town. On foot you should get yourself to Ulus Meydane, easily identifiable by the large Ataturk equestrian statue on the corner. Turning right onto Hisarparki Caddesi you'll see the citadel rising up ahead of you. Turn right again when you reach Ipek Sokak and as you approach you'll see the tour buses lined up outside the museum gates above you and to your left.
The collections place an unusual emphasis on the earlier of Anatolia's occupiers, starting with an interesting exhibit of finds from the Catal Huyuk site, often described as the earliest known human community in the world. Other highlights include a collection of tablets, the translations of which remind you how little some things in the world have changed over the millenia.

Open every day except Monday (8:45 - 5:15)

Museum of Ethnography

Between Ulus Meydani and the Sihhiye bridge you'll find the Museum of Ethnography perched above the busy highway in an attractive. It is one of the better of such museums in Turkey and the collection's highlights include the circumcision room, some nice woodwork and fine calligraphy.

Open everyday except Monday (8:30 - 12:30, 1:30 - 5:30)

Old Turkish House Museum

The Ankara citadel is a jumble of tiny streets and ramshackle houses and was the heart of many of Ankara's previous incarnations. One of these houses has been restored and opened as a museum and you'll find it just inside the Parmak Kapisi, the gate that you come to if you approach the citadel from Samanpazari.

Railway Museum

Part of the main railway station, the Railway Museum (Demiryollari - Iron Roads) will be of interest to those of you who like trains. You'll probably have to rustle up somebody with a key but as long as your within the museums stated opening hours (9-12, 1-5) this shouldn't be a problem.

Old Locomotive Museum

This one is a little more fun. It's basically a car park like area with scruffy looking trains scattered about, good for kids and anyone who likes old steam. Take a taxi to Achuk Hava Buharlu Lokomotif Muzesi from the Sihhiye bridge area.

Republic Museum

Really only of interest to those studying the birth of the Turkish Republic, this building, close to Ulus Meydani, was once the headquarters of the National Assembly. The exhibits document the early history of the republic's parliament, if you don't read Turkish you'll be restricted to looking at the photographs and sampling the atmosphere of the place.

War of Salvation Museum

This building was the first home of the National Assembly, before it's move to the now Republic Museum. The events and faces of the War of Independence are portrayed here, again, with captions only in Turkish. It's hard to avoid the feeling that something important happened here.

Museum of Painting and Sculpture

A major collection of modern Turkish painting, which may or may not be to your taste. The museum features the work of Osman Handi, Hikmet Onat, Turgut Zaim and Bedri Rahmi Eyuboglu amongst others. Right next door to the Ethnography Museum. Similar opening hours and free admission.

Presidential Mansion

Set within landscaped parkland, Ataturk's one time country retreat is now well within the bounds of the present day city. Not many visitors (or even residents) make it here but you might enjoy the 1930's flavour of the place. Located at the southern end of Ataturk Bulvari, you'll have to ask one of the guards for the Cankaya Koshku and swap your passport for an ID badge. Only open on Sunday afternoons (1:30 - 5:30) and holidays (12:30 - 5:30).

Anit Kabir

Almost a decade in the building, Ataturk's Mausoleum really should be on the itinerary of any visitor to the country's capital. Visible from most highpoints within the city, the mausoleum grounds house a memorabilia museum and the sarcophagus of Ismet Inonu, a major figure in the Republic's history. The tomb itself is an impressive piece of work. Check it out yourself and don't forget to buy a certificate proving that you were there.
From Kizilay, head west along Gazi Mustafa Kemal Bulvari, then a left onto Maltepe Sokak. This will bring you to Genclik Caddesi where you should turn right. A left into Akdeniz Caddesi will bring you the rear entrance to the park. Head around to the front to get in with the minimum of hassle (although you'd probably take a taxi if you wanted to avoid hassle).
Open 9:00 - 12:30 and 1:30 to 5:00 or 4:00 (seasonal). Admission free.