As per my opinion Europe, Singapore, USA, China and India (Agra, Ajanta Ellora, Jaipur, Kanyakumari, Kashmir and Goa) these five best tourism destination countries in the world.
Spain: Spain is a tourist country with 75.6 million visitors annually, mostly from European countries such as the United Kingdom, Germany, France and Italy. Tourism accounts for 11% of the country's national GDP. Spain has historic cities such as Barcelona and Madrid, popular festivals and resorts on the coast. Mediterranean and Atlantic, 15 national parks, and UNESCO World Heritage sites 13 Spanish cities
Italy: The most important tourist attraction in Italy is its stunning natural features, which include mountains, coasts and lakes. It is also rich in art and architecture because it is the cradle of the Roman Empire and the Renaissance. Italy has the largest number of sites on UNESCO's cultural and heritage sites, Among the most important tourist attractions in Italy are the Colosseum, the Venice Canal, the Vatican City, the Cathedral of Milan, the Pantheon, and St. Mark's Basilica
Canada: Canada is the largest North American country in terms of size and is renowned for its magnificent natural scenery, making it one of the most popular tourist destinations in the world. It includes the most important natural destinations and attractions visited by many tourists such as Waterton Lakes National Park, Terra Nova National Park, Niagara Falls, Cape Breton Island, Algonquin Park and other places. You can also enjoy the wildlife in this country as well as have fun while watching bears and whales
Indonesia: Indonesia is one of the most popular tourist destinations in the world, with its beaches and stunning beaches such as the island of Bali, as well as other fascinating attractions.
Greece: Greece is one of the countries attracting tourists. In addition to the beautiful landscapes, many musical festivals, celebrations and theaters are held there. The Greek government is very encouraging to attract tourists. However, tourists from many countries need To a visa before traveling to it
Turkey : Go to Turkey to see the gorgeous mosques, majestic castles, and natural wonders such as Pamukkale (aka "Cotton Castle"), a plethora of white travertines filled with mineral-rich water. Also go for the newly built Soho House in Istanbul’s romantic Beyoğlu district
Spain : Since Ferran Adria's elBulli restaurant rose in Catalonia, Spain has been the world's undisputed epicenter of cutting-edge cuisine. Planning an entire vacation around the fine-dining restaurants you want to splurge at and the most famed tapas spots is a good idea. A Fodor's forum suggests visiting Spain in April for the best weather. You can also catch Barcelona's food-filled April Fair then.
Italy : Who can resist the call of pasta and beautiful people? Not many, according to the CNT readers, who've voted for Italy as the world's best country to travel for five straight years. Italy is all about leisure — sip wine for hours in Venice's Piazza San Marco, make friends with a hammock on a villa in Tuscany, or sunbathe on the cliffs of Riomaggiore.
Canada : From wilderness camping on Vancouver Island to a stay at North America's oldest Ritz-Carlton in Montreal, Canada offers travelers all types of experiences. A ride down the toboggan lanes in Quebec City is a must in the wintertime.
Italy is a favorite destination for millions of tourists (48.6 million, in fact) due to its temperate climate, extensive and dramatic coastline, strong culinary heritage, and host of archaeological sites. (It has 51 World Heritage Sites, the most of any country.) Experiencing one of the most fragmented histories of any country, Italy emerged from numerous conquests and invasions over thousands of years as the state we now know just after World War II. The Italian diaspora – largely from unindustrialized southern Italy – has fueled a global dispersion of and interest in Italian culture.
China - 55.6 million
Though seven of the top ten visited cities in the world are in Asia, only one East Asian country (bar Russia) has made it onto our top 10 most visited countries list. China’s inclusion should come as no surprise. One of the original cradles of human civilization, the global powerhouse is the most populous country (1.35 billion people) on Earth. China has been cited as one of the most complex economies (for over 2,000 years) due to its cyclical history of prosperity and decline. As the world’s largest exporter (and second-largest importer), it’s no doubt China will see substantially more than 55.6 million (in 2014) tourists year-over-year in the near future.
Spain - 65 million
One of only three countries boasting both Mediterranean and Atlantic coastlines, Spain brought in 65 million tourists last year. Drawing in millions of tourists from its former colonies in Latin America and its position as the major European trade hub for Latin America. Such numbers have made Spain the second-largest tourism destination in the world in terms of spending: on average, each tourist spends $1,000 per visit and tourism makes up over 5% of Spain’s GDP.
United States - 74.8 million
Thought the United States would clinch the top spot? It’s just off, coming in at number two with nearly 75 million tourists in 2014. The world’s largest economy by GDP (both nominal and real), America is also one of the world’s most multicultural countries due to hundreds of years of immigration. Despite being the second most visited country, the United States had tourists spending more than in any other country – 177.2 billion dollars in 2014 compared to 65.2 billion in number two Spain.
France - 83.7 million
Paris’ place as the fifth most visited city in the world hasn’t stopped the country of France as a whole from clinching the top spot – and by a hefty margin. Receiving almost 10 million more tourists than the U.S., France held the second-largest colonial empire in history, a major factor in her close relations with many countries and territories around the globe. Despite the 15 million who visited Paris, France holds deeper appeal for tourists in its lush wine regions, coastal resorts, and small villages dotted throughout the country, bringing in a cumulative total of 83.7 million visitors.
It depends on what is meant by the world. If it is the world of terrestrials, because now Terrans have also populated the space, then I would like to go: on the Moon and on Mars because the lunatic terrestrials and the Martian terrestrials speak well of it; on Vulcan to see if the other Vulcans are as intelligent as Mr. Spock of the starship USS Enterprise (Star Trek); on Kepler 452-b to see if indeed it is similar to the earth and if it is possible to send there a few some despotic terrestrial presidents; finally I would like to live for some time (a few thousand years) on Kepler-1647 b to be sure to always have a place in the sun, as this exoplanet has two. :)
Austria is the world’s most tourist-friendly country, with high scores across the board. In addition to having all seven major car rental companies, the European country places third for quality of tourism infrastructure and fifth for number of hotel rooms per capita
Portugal ranks highly in every indicator under the tourist service infrastructure category, and especially so in ATMs, car rental companies and quality of tourism infrastructure. They also have high scores in other Travel and Tourism Competitiveness categories, including safety and security and international openness, making the country an all-around comfortable place to visit.
Croatia ranks fifth for tourist service infrastructure, with plenty of hotel rooms and ATMs per capita. Although the quality of their infrastructure is comparatively low, ranking 65th, Croatia has plenty else to draw tourists, with high scores in natural resources and environmental sustainability.