Teruel's most popular and interesting attraction pulls out the stops on the city's famous legend of the lovers (amantes) Isabel de Segura and Juan Diego Mártinez de Marcilla. The lovers' mausoleum sits in a side chapel of the Mudéjar Iglesia de San Pedro and there are various ticket options for different parts of the complex, but the complete visit to the mausoleum, church, cloister, tower and ándito (exterior walkway) is well worth it.
The complete visits are guided, in Spanish only, but English and French audio guides are available and the only parts where you have to follow the guide are the tower and ándito. You begin with an audiovisual display on the history of the Amantes and Teruel, then move into exhibition rooms that include the Mausoleo de los Amantes itself, where the lovers' remains are entombed beneath modern alabaster effigies sculpted by Juan de Ávalos, with their hands almost (but not quite) touching. You'll learn not just the story of the lovers' lives, but also about the bizarre treatment of their mummified bodies since their deaths.
From the mausoleum you progress into the 14th-century Iglesia de San Pedro, which is Teruel's only Mudéjar church (as opposed to tower) – though the predominant impression is made by its colourful murals and gold-starred ceiling by Salvador Gisbert, fruit of a Modernista renovation around 1900. The cloister and adjoining garden comprise act three. For a final flourish you are led up the 13th-century Torre de San Pedro, the oldest of Teruel's four surviving Mudéjar towers, and then round the ándito, an unusual arched walkway circumnavigating the upper levels of the church's exterior, for panoramic views over Teruel.