Welcome to Nairobi, safari capital and the largest city in Kenya. At one time a simple hydration spot for the Maasai, this high-energy East African city now strikes a balance between the cosmopolitan and the natural. In its adjacent Nairobi National Park, visitors will see lions, zebras, giraffes and rare black rhinos.

Slovakia has a primarily continental climate, with warm summers and cold winters. The Carpathian Mountains endure harsher winters and receive heavy rainfall.

Palenque, nestled in the lush jungles of Chiapas, Mexico, offers an enthralling glimpse into the grandeur of the ancient Maya civilization. The city is renowned for its well-preserved ruins, which include the majestic Temple of the Inscriptions, where the tomb of the ruler Pakal the Great was discovered in 1952.

This quaint town on the Rhine is the gateway to the Black Forest and lies halfway between Freiburg and Colmar. As you walk the cobblestone streets, stop to sample local schnapps made from fermented pears or cherries and the distinctive smoky ham of this region. St. Stephan's Cathedral perches on a hillside and is the exquisite centerpiece of the town.

The Sacred Valley, located in the Andes and divided by Urubamba River, was part of the larger Inca Empire, along with Machu Picchu and the closeby town of Cusco. Tourists will see green agricultural landscapes and Spanish hamlets like Ollantaytambo and Pisac, the latter featuring a Sunday market.