At 210km from Ankara (130 often meandering miles and easily 4 1/2-5 hours by bus/dolmus), a private car, which will cut the trip down to 2 1/2 hours each way, is an absolute must. To get there, take highway 200-E88 out of Ankara and follow the signs for Samsun. Take the turnoff for Çorum, following past Delice and Süngürlü, and begin looking for signs for Bogazköy and the archaeological site. (The highway winds through a spectacular and desolate landscape -- so be sure to fill up the tank before you go, because petrol stations in these parts pump pretty much only diesel.) The site is located at the summit of an imposing and rocky terrain high above the fertile valley of the village of Bogazköy.
To get there from Ankara by public transportation (if you insist), take a bus to the center of Süngürlü, where you'll be changing to a dolmus for the remaining 22.5km (14-mile) ride into Bogazköy. Dolmuses run from 7:30 to 7pm from Süngürlü and from 7am to 4:40pm from Bogazköy. Taxis from Süngürlü run around 30€; clients of the Hattusas Pansiyon, Baykal Hotel, and Asikoglu Hotels can get a pickup for free.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.