Enna is more or less halfway between Catania and Palermo, just off the central A19. Its worth a stop just to take in the views, but there are also a few worthwhile buildings to view and a couple of nice piazzas for a bite or an ice cream.
Leaving the A19 (by far the fastest route to the west coast, far faster than the A20 and with fewer tolls), follow the signs to Enna. First you'll come to Enna (bas) - I think – anyway, that's not it, the Enna you want is actually up on top of the hill.
Arriving in Enna, you may be surprised to find that its outskirts are mostly unattractive postwar blocks of flats; following the route to the centre of town, they gradually get replaced by the older core of the old town. The streets are narrow and traffic will probably be heavy. Parking is, as usual, the problem. You must simply roam around until you find yourself a spot around the edges of one of the piazzas, or on a street. Then you must buy and display a ticket (0.50 Euros per hour, bought usually from a nearby bar). Then you're set to wander.
A must-see is the view over the lower hill towns across the scorched interior from Piazza Garibaldi. Then wander around the older part of town, taking in the Duomo in the Piazza Mazzini before heading to the highly impressive 13th-century Castello di Lombardia.
On the way there, you may well pass the only hotel in town - the Sicilia - in the Piazza Colainni, and my word, does it look grim from the outside!!!
After that it’s time to hit the road. Enna is the sort of place you can see quite easily in 2 hours, and with little to offer in the way of accommodation options or nearby attractions - it pretty much is in the middle of nowhere - you're not likely to feel compelled to stay much longer.