Istanbul is bustling biggest city in Turkey, located on Bosporus strait. The place was known as capital of Roman, Byzantine, Latin, and Ottoman Empires. Nowadays it is one of the most visited places in the World, having big variety of old architecture – mosques, palaces, baths, churches, so on.
If you go to Istanbul from Edirne as a daytrip, you also have to add a bit less than 1 hour to go from Istanbul bus station to central parts (Sultanahmet, Taxim).
Karaagac is a small town just outside Edirne and practically right on the border with Greece. It is an attractive, leafy town, the streets lined with large, shady trees. It is also home to Edirne's historic, grand railroad station, which is now part of Trakya Universitesi (University of Thrace).
The immediate area outside and just around Edirne is very attractive and rather lush. The rivers are scenic and have thick forested vegetation along them, with restaurants and other places to relax along their banks. Also just outside Edirne is the sleepy but attractive and very wooded small town of Karaagac. See my tip on it.
This mosque sits on top of a small hill to the north-east of the Selimiye Mosque. It was built in 1433 by Murat Han II and is famous for its tiles, although I couldn't get inside as it was locked when I visited. It's mihrab is said to be the second largest tiled mihrab after that of the Yesil Mosque in Bursa. The mosque was damaged by an earthquake in 1752 and it was restored by Sultan Mahmut I and was recently renovated in 2006.
Although many travel books describe the Trakya region as "boring" it is nevertheless a very pleasant area in which to travel. Most of it is gently rolling countryside of fields and without dramatic mountains or gorges, but is is nevertheless quite pretty and pleasant countryside. There are also some beautiful thickly forested hills and mountains to the south of Edirne on the road between Edirne and Gallipoli.
Almost surrounded by rivers, including the large Meric, Edirne has a lot of bridges, many of them very old. They cross the numerous waterways at many points and include a number of wonderful Ottoman structures. One will cross some if going to places like Beyazit, Sarayici, Karaagac, etc.