Built in the 1300s to protect the Alcazaba and house troops, Gibralfaro Castle still has walkable ramparts with some of the best views over Malaga, the port, and the coastline. Inside, there’s a small military museum. The name comes from Jabal-Faruk, meaning 'hill of the lighthouse' in Arabic. The castle was also the site of a long siege in 1487, when Catholic forces took the city from the Moors.

If snorkelling and/or scuba diving sounds like your idea of fun, Cartagena is the place to indulge. Waters of the Caribbean washing over this part of the coast hold abundant marine life, including multiple varieties of tropical fish and corals, and the several underwater shipwreck sites make for exciting diving. The archipelagos of Rosario and San Bernardo are both excellent for either.

If you're interested in watches, this museum houses an important collection of timepieces from the 16th century onward and the finest creations of this Geneva-based watchmaker. Nowhere else is the Swiss passion for clocks, watches and the passing of time as obvious as here.

Debrecen’s symbol is one of the nation’s largest Reformed churches, a building of major historic significance. It was here that Lajos Kossuth read out the Declaration of Independence on April 14, 1849. The wing chair used by the Regent-President on that glorious occasion is one of the church’s most precious relics. The main structure has been rebuilt several times. Today’s familiar Classicist form was developed after the great fire of 1802. You can enjoy magnificent views of the city from the top of the towers, or the steel bridge behind the tympanum. If you are courageous enough to attempt the steep climb up, your added bonus will be a spectacular close-up of the 5.6-ton Rákóczi Bell. In addition to regular services, exhibits of religious history, organ concerts and other musical events are also on the schedule. The church has held the status of national monument since 2013.