Edirne, historically known as Adrianople - founded by the Roman emperor Hadrian on the site of a previous Thracian settlement named Uskudama) - is a city in the northwestern Turkish province of Edirne in the region of East Thrace, close to Turkey's borders with Greece and Bulgaria. Edirne served as the third capital city of the Ottoman Empire from 1369 to 1453, before Constantinople (present-day Istanbul) became the empire's fourth and final capital between 1453 and 1922. The city's estimated population in 2019 was 185,408.

Situated 7 km (4.3 mi) from the Greek and 20 km (12 mi) from the Bulgarian borders, Edirne is famed for its many mosques, domes and minarets. The Selimiye Mosque, built in 1575 and designed by Turkey's greatest master architect, Mimar Sinan (c. 1489/1490-1588), is one of the most important monuments in the city. It has the highest minarets in Turkey, at 70.90 m (232.6 ft) and a cupola 3 or 4 ft (0.91 or 1.22 m) higher than that of Hagia Sophia, the former Byzantine Orthodox Cathedral (now mosque, museum from 1935-2020 )in Istanbul. Carrying the name of the then reigning Ottoman Sultan Selim II (r. 1566-1574), this mosque futures Turkish marble handicrafts, and it is covered with valuable tiles and fine paintings. Other notable mosques are Eski Cami (Old Mosque), and Burmali Cami.

Edirne has three historic covered bazaars: Arasta, next to Selimiye Mosque, Bedesten next to Eski Cami and Ali Pasa Çarsisi (Ali Pasha Bazaar).

Besides the mosques, there are visitor attractions in Edirne, all reflecting its rich past. The most prominent place being the Edirne Palace (Ottoman Turkish: Saray-i Cedid-i Amire? for "New Imperial Palace") in Sarayiçi quarter, built during the reign of Murad II (r. 1421-1444). Although the buildings of the palace and its bath (Kum Kasri Hamami) are in ruined form, the palace gate and the palace kitchen facility are restored. The Kasr-i Adalet ("Justice Castle"), built as part of the palace complex, stands intact next to the small Fatih Bridge over the Tunca river.

Another notable building in the area is the Complex of Sultan Bayezid II, an important monument with its complex construction comprising many facilities used in those times.

The Balkan Wars Memorial Cemetery is located close to the Edirne Palace, with an unknown soldier monument featuring an Ottoman soldier in front of its entrance.

The historic Grand Synagogue of Edirne, abandoned and ruined, was restored and re-opened in March 2015. A Roman Catholic and two Bulgarian Orthodox churches are found in the city.

Edirne has several historic arch bridges crossing over the rivers Meriç and Tundzha, which flow around west and south of the city.

There are caravansaries, like the Rustem Pasha and Ekmekcioglu Ahmet Pasha caravansaries, which were designed to host travelers, in the 16th century.

The historic Karaagaç railway station hosts today, after redevelopment, the Trakya University's Faculty of Fine Arts in Karaagaç suburb of Edirne. Next to it, the Treaty of Lausanne Monument and Museum are situated.