Deva is a compact town on the Mureș river in western Transylvania, dominated by a volcanic plug topped with the ruins of a medieval citadel. It is not a major tourist destination, but it sits at a useful crossroads — close to Hunedoara's famous Corvin Castle, midway between Timișoara and Sibiu on the main rail corridor, and within striking distance of the Apuseni Mountains to the north.
The town itself is tidy and unhurried. Piața Victoriei is the main square, ringed with cafes and the usual post-communist commercial bustle. The real reason to spend time here is the hill: Citadel Hill (Dealul Cetății) is a protected nature reserve as well as a historic site, and the funicular ride to the top rewards you with a panoramic view of the Mureș valley that makes everything else seem small.
Beyond the citadel, the surroundings deserve at least a half-day. The Simeria Arboretum, a few kilometres east along the river, is one of the oldest and most varied arboretums in Romania. The Roman site at Mintia (ancient Micia), once a legionary port on the Mureș, is an open archaeological site with finds dating from the Dacian and Roman periods.
Deva is a practical base for the region. If you are heading to Hunedoara — which you should be — it is an easy 20-minute drive south.