This is a city one could get lost in for days, exploring the old Ming Dynasty walls and wandering through its superb museum. If time permits, you should also take a walk through Linggu Park, home of the Linggu Pagoda and other items of Buddhist interest. Even just a casual walk through the streets-replete with food vendors and baskets of live geese-will help convey the unique flavor of this city.

Sintra, located just 40 minutes from Lisbon, feels like a world apart. Tucked into the hills of the Serra de Sintra, this town has drawn kings, poets, and explorers for centuries. It was once the summer retreat of Portuguese royalty, who left behind palaces and gardens that seem pulled from a storybook. The most famous, Palácio da Pena, is perched high above the town with bold red and yellow towers that blend Romanticism with Moorish and Gothic styles.

Maui, both second youngest and second largest of the Hawaiian Islands, is home to the world's largest dormant volcano, Haleakala, meaning "House of the Sun." Last erupting about 200 years ago, it makes up the eastern end of the island. Maui was formed by volcanic activity from Haleakala on the east and the West Maui Mountains to the west. The connecting isthmus between the two spots was formed from joining lava from both and gives Maui its nickname, the Valley Isle.

Khao Yai National Park is one of the most interesting and oldest park in Thailand. It is northeast of the central plain of Thailand, on the rim of the Korat Plateau. There are many species of plants and animals. Large animals such as wild elephants and tigers prowl the jungles freely. More than 800 species of orchids grow there and over 200 species of day moths have been catalogued.

Capri, a jewel of the Tyrrhenian Sea, has long been a favorite retreat for emperors, artists, and writers. This enchanting island off Italy's Amalfi Coast captivates with its dramatic cliffs, turquoise waters, and timeless elegance. The most iconic sight on Capri is the Blue Grotto, a sea cave illuminated by a magical blue light created by sunlight passing through an underwater cavity.