Cardigan sits on the west coast of Wales, where the River Teifi reaches the wide sweep of Cardigan Bay. At the heart of town stands Cardigan Castle, where battlements and gardens overlook the Teifi. The castle’s history includes the first recorded National Eisteddfod in Wales, a cultural competition of music, poetry and performance that still inspires events across the country.

Plymouth is a town in southeastern Massachusetts, on Plymouth Bay, about 55 km (34 mi) southeast of Boston. The seat of Plymouth County, it was the site of the first permanent European settlement in New England; it is now a fishing and tourist center with ship-related industries and cranberry-packing houses.

Ifrane is a mountain city in Morocco’s Middle Atlas, set at about 1,650 metres above sea level between Fez and Meknes. Its high elevation gives it a cooler climate than many Moroccan cities, with regular winter snowfall and mild summers.

Potsdam, the capital of Germany’s Brandenburg state, lies just southwest of Berlin and is best known for its grand palaces, landscaped gardens, and role as a seat of Prussian royalty.

Freiburg was founded by the Dukes of Zähringen in 1120, and the layout of streets and squares of the rapidly prospering metropolis is still impressively reflected in today's cityscape.