Cathedrale St-jeanApprox. Time: 3 hours
Activity Level: Easiest

The soaring columns of this grand cathedral have withstood eight centuries of revolutionary destruction. Although construction began in the 12th century, the building of the Romanesque cathedral spanned over three centuries. Within the walls where Henri IV and Marie de Medicis married stands a remarkable marvel of time, a 14th-century astronomical clock keeps the time by popping bell-ringing statuettes out of its front at the top of every hour.