Mudanya is Bursa's port on the Sea of Marmara, close enough to the city to work as a short escape but with a different mood: sea air, old Greek and Ottoman houses, ferry traffic, olive hills, and a waterfront that looks back toward Istanbul.
The reason to come is the Mudanya Armistice House, where the 1922 armistice helped end the Turkish War of Independence and cleared the path toward the Republic of Turkey. Around it, the older streets still hold pockets of timber houses, though concrete has been gaining ground.
Mudanya is best treated as a Bursa day trip rather than a full base. Pair the armistice house with the Tahir Pasha Mansion, then continue west to Tirilye, a former Greek fishing village with stone lanes and the old Church of St Stephen, now Fatih Mosque.
It is not a polished resort. The beaches are ordinary and the town is partly a working ferry port. But if you are already in Bursa and want one spare day by the Marmara with real historical weight, Mudanya earns the trip.