Make sure you have a full tank of gas, because Nantes is worth making a detour for. Located 25 miles from Riaille, it offers some wonderful attractions, such as Chateau of the Dukes of Brittany and Nantes Cathedral. Still in the mood for some sightseeing? Punch Angers into your GPS. This delightful destination is also home to some top-notch sights like Chateau d’Angers and Angers Cathedral, and it’s just 35 miles away.