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.

Dambulla, situated in the Central Province of Sri Lanka, is best known for its rock temple complex that has been in use for over two thousand years. The Dambulla Cave Temple, also called the Golden Temple of Dambulla, is made up of five caves carved into a granite outcrop, filled with over 150 Buddha statues and intricate wall paintings. These caves were first used by King Valagamba in the 1st century BCE as a refuge during exile, and later transformed into a sacred site.

Also known as Limnos, Lemnos is the 8th-largest island of Greece, located in the Aegean Sea off the coast of Turkey. Its capital and main port is Myrina, a village stretched along two picturesque bays and overlooked by the ruins of an imposing Byzantine castle.

Louisville is a city that knows how to make an impression. Birthplace of the Kentucky Derby, home to bourbon legends, and packed with stories that stretch back over two centuries, this river city blends tradition with bold creativity. Start downtown on West Main Street, also known as Museum Row. Here, visitors can tour the Louisville Slugger Museum & Factory, where real bats are still made, and marvel at the 120-foot baseball bat leaning against the building.

Uluru-Kata Tjuta National Park, national park in the Northern Territory, Australia, in the arid center of the continent, southwest of Alice Springs. The area was established as Ayers Rock/Mount Olga National Park in 1958 and renamed Uluru National Park in 1977.