Lisbon
The views from the ramparts of the Castle of St George are among the best on offer in a city where spectacular views are practically a dime dozen. You may prefer to scale the 28-metre Monument to Christ to look back across the Tagus River at the city, or the Discoveries Monument for a bird’s eye view of Belem. Lisbon’s World Heritage-listed sites pay tribute to its seafaring past: Belem Tower was a starting point for many of the Voyages of Discovery from the 16th century onwards, and Jeronimos Monastery contains countless motifs of explorations.