Mt Aragats, the highest point in Armenia, is an old volcano. Its crater is eroded and now forms 4 separate peaks. The highest is the northernmost one, at 4090m. We climbed the south peak (3879m). It sounds quite high, but the hike starts at lake Kari, at 3190m.
The southern slopes of Aragats have a few interesting sights, among which the Amberd fortress is the most significant. Set at an altitude over 2000m, it is a bulky construction from the 12th century. Most of it is crumbling in fact, but the impression of might remains. It even withstood Mongol invaders in 1236. It was finally abandoned in 1408. Inside the fortified enclosure is an older church, from 1026.
Views of Mt Ararat (in present day Turkey) from Mt Aragats are stunning. In summer the visibility is not at its best, but we were lucky enough to have a bright cloud free morning when climbing (though by the time we reached the summit, the clouds had caught up with us!). Ararat is 5165m, making it the highest Turkish summit.