At Bomarzo, 17km northeast of Viterbo, is a 16th-century pocket of weirdness that will entertain children and adults alike, the Parco dei Mostri. The gardens of the Palazzo Orsini is peopled by ancient gigantic sculptures, including an ogre, giant and a dragon. From Viterbo, catch the Cotral bus from near Viale Trieste to Bomarzo (€0.60, 30 minutes), then follow the signs to Palazzo Orsini.