Step back in time and imagine Italy as it was during 550 B.C. At least, that’s what you can do when you visit The Cilento—home to the remains of two ancient Greek cities: Paestum and Velia. To experience life a little later on, head to the Certosa di Padula, a Carthusian monastery (and World Heritage site) that dates back to 1306 and is known for its Baroque-style architecture. The park’s landscape also hints at these forgotten times with its vast seaside views and deep cave systems such as the Grotte di Castelcivita.

One of the most historic sites in Spain, Girona lies in northeast Catalonia, just 99 km (62 mi) from Barcelona. Founded by Romans, the city later was taken over by Moors and Franks before finally falling under the rule of Barcelona. Influenced by different cultures and religions, the city beckons visitors with beautiful architecture. The Old and New Town offer many opportunities to pleasurably get lost and observe local life and culture.

In Santander, enjoy the beautiful beaches of Playa de la Magdalena and El Sardinero, a historic city centre, and an epic planetarium, all while breathing in glorious coastal air. Of course, there are plenty of gorgeous Gothic cathedrals that will impress and inspire.

Billing itself as one of Denmark's friendliest towns, Kolding certainly appears welcoming—its streets lined with cherry red Danish flags that seem to be constantly waving hello. A medieval castle towers over vibrant parks that bloom with flowers and medicinal spices. On balmy days families will be grateful for SlotssøBadet, an extraordinary waterpark that's a blast for all ages.