Christ Church Cathedral is Dublin's oldest building, on ground where Viking king Sitric Silkenbeard built a wooden church around 1028, shortly after converting to Christianity.

After the Norman invasion, it was rebuilt in stone by Richard de Clare, known as Strongbow, whose tomb still lies inside. Archbishop Laurence O'Toole, who oversaw it, was canonised in 1225; his heart remains in a shrine here.

The south wall and roof collapsed in 1562 and took over a century to rebuild. Most of what stands today is Victorian, funded by a whiskey distiller named Roe. The crypt, the largest in Britain and Ireland at 63 metres, once housed bars and breweries, and holds two mummified bodies: a cat and rat found in an organ pipe in 1850 and name-checked by Joyce in Finnegans Wake.

VoiceMap's self-guided audio tours trace the cathedral's Viking origins, Strongbow's conquest and the medieval city that grew around it.