Where in the world is this?

Enter our mystery travel picture competition for June and you could win three superb DK travel guides of your choice, worth up to £19.99 each. This month it’s a tropical island with a capital that has eight blue sculptures of horses. They mark the day in the 18th century when dozens were tricked into jumping from an anchored ship and swimming to the island, starting the local horse trade and boosting the economy. If you know the location, enter at mirror.co.uk/travel where you’ll find cryptic clues to help you.