Ruins of Ross Errilly Friary, County Galway, Ireland (© Maria Janus/Shutterstock)

What do swans, secret hideaways and a medieval fish tank have in common? They're all part of the story of Ross Errilly Friary. Founded around 1351, this well-preserved Franciscan friary in Ireland is often called Ross Abbey, though it never had an abbot because it was never an abbey.