This is a quite interesting and rather unique site spread over several places in the northeastern region of Aragon. It includes churches and secular buildings combining Christian (Gothic) and Muslim architectural features and decorations. The site is centered on the pretty town of Teruel, where it includes the Tower of El Salvador (which houses a nice museum), the Tower of San Mart�n (not accessible), the cathedral (impressive from the outside, but not really great inside), and the Church and Tower of San Pedro (very nice, but can only be visited with a Spanish-only guided tour; it includes a museum about a local legend featuring 2 star-crossed lovers). Those arriving by train will notice a huge fake-Mudejar staircase leading into town. The major city of Zaragoza also includes a few Mudejar buildings, the most interesting of which I found to be the large, fortress-like Aljafer�a Palace, which is a smaller version of the Alhambra and has a really beautiful courtyard. The La Seo Cathedral is also very impressive, both inside and outside. San Pablo Church and Tower is easy to find between the Aljaferia and the Cathedral, but was closed when I was there (the tower and the facade are the most interesting part anyway). Even though Zaragoza is not on most people's itineraries, it has a fair number of interesting sites (the most famous is the huge Pilar Basilica) and is on the high-speed train line between Barcelona and Madrid. From there, I took a quick train ride to the small town of Calatayud, where the Tower and Church of Santa Maria is inscribed (again the church was closed, but you can see quite a lot from the outside). The WH site also includes 2 churches in the small villages of Tobed and Cervera, but I couldn't even find them on a map. I really enjoyed hunting out the Mudejar sites, and I found all of them to be beautiful and well-preserved. If you have trouble with Spain's opening times, it is safe to say that the interesting part in most buildings is the facade, so it is not absolutely necessary to see the inside as well.