Ajloun Castle (Qalat ar-Rabad) was built in 1184 by a nephew of Saladin to watch over the Jordan Valley and guard against Crusader raids from the west. It's a proper hilltop fortress — arrow slits, stone stairwells, a dry moat — surrounded by the greenest hills in Jordan, part of the Ajloun Forest Reserve's oak and pistachio woodland. Most people combine it with Jerash on the same day, since the two sit about 30 minutes apart.
Ajloun is about 75 minutes from Amman (73 km) and roughly 30 minutes from Jerash, which is why the two are almost always visited together on a single day trip. There's a short, steep walk up to the castle entrance from the car park.
Spring (March-May) is genuinely the best window here — the forest reserve is green and the wildflowers are out, a rare sight in a country that's mostly desert. Autumn is a close second. Summer works too since the elevation keeps it cooler than Amman or the Jordan Valley.
The castle takes about an hour to see properly, including the small museum near the entrance. Bring a flashlight or use your phone's — some internal passageways and stairwells are unlit. If you have extra time, the reserve's cabins and short trails are worth slowing the itinerary down for rather than just stopping for photos.
