The town is host to a restored 16th century church, called "the Cathedral", built on ruins dating from the time of the Suebi, as far back as to the fourth century — the first Visigothic cathedral built on the Iberian Peninsula. Near the cathedral is the largest collection of Roman epigraphs in Europe, in an ancient building refurbished as a modern museum to contain the carved and inscribed Roman stones. The Roman epigraphic collection in Idanha-a-Velha is one of the largest and most representative in Portugal. It was compiled during different phases of archaeological investigation in the village. It is located in the grounds of the old olive press in the south-eastern part of the village and was set up to show the collection, which before was at Santa Maria Church or the Cathedral. The new museum project made it possible to study and publish this important collection and organise the exhibition Verba Volant, Scripta Manent (words fly but writing endures). Eighty-six of the 210 pieces are on display, harmonising traditional exhibition techniques with multimedia technology. Scientific accuracy made it necessary to offer effective access to the contents to a wide audience and so an interactive exhibition was designed where technology helps to contextualise and interpret the pieces. This project encourages the use of local heritage through scientific research, preservation of archaeological findings and the use of new technology to meet the needs of qualified tourism for the location. There is also a 17th-century pillory in the village square. Nearby stand the ruins of "a Torre dos Templários", a tower constructed on the ruins of a Roman temple dedicated to Venus. It was part of the civil parish of Alcafozes from 1900 to the early 1930s. In 2013, the civil parish of Idanha-a-Velha merged into the new parish Monsanto e Idanha-a-Velha.