Lake Toba is another of the island's spectacular sights - a remarkable volcanic crater set in the middle of northern Sumatra, 176km from Medan. The lake is huge (the largest in South-East Asia), occupying the caldera of a giant volcano that collapsed on itself after a massive eruption some 100,000 years ago.

The capital and largest city in Hungary, Budapest is a favorite European destination for millions of tourists each year. Once the center of the Austro-Hungarian Empire, this cosmopolitan city and UNESCO World Heritage site has plenty of historical and cultural landmarks to explore.

Gold Harbour is a small bay on the southeastern coast of South Georgia, where a narrow beach sits beneath steep mountains and hanging glaciers. The site is known for its rich concentration of wildlife and its dramatic setting, with the snow-covered Salvesen Range forming a backdrop behind the shoreline. The name reflects the golden appearance of the cliffs and mountains when illuminated by low sunlight.

One visit to Tsingy de Bemaraha National Park in Madagascar and you may find yourself feeling like you have stepped onto another planet. The mineral forest was formed nearly 200 million years ago and has become a popular destination for adventurous hikers from around the world. The hanging bridge, while not for the faint of heart, is one of the most photographed spots within the park.

Granada, Nicaragua, founded in 1524, is one of the oldest European-established cities on the mainland of the Americas where visitors can explore cobblestone streets lined with brightly painted facades. The mustard-yellow Granada Cathedral dominates the central park and provides an easy reference point for those navigating the city on foot or by traditional horse-drawn carriage.