Strasbourg is small enough to enjoy its varied attractions in a day. Join guided tours round the European Parliament and the Council for Europe; visit the wonderful cathedral and see the fascinating astrological clock.
Stroll round the Petite France area with its timbered buildings and shops, and have lunch at the mediaeval Maisons de Tanneurs.
Afterwards, take a leisurely boat trip on the canal which circumnavigates the city. Should you have the stamina, pay a visit to one or more of the many museums and art galleries, the planetarium, the botanical garden or the zoological museum.
All this only three and a half hours from London by Eurostar.
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