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39. Morocco - 164,000 Americans chose this north African destination for their vacation in 2015.

What to see: Djemaa El-Fna, Ait Benhaddou (pictured), Fes, Erg Chebbi, and the Draa Valley.

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38. Poland - 197,000 Americans chose this eastern European destination for their vacation in 2015.

What to see: Main Market Square, Warsaw Old Market Place, Gdansk Old Town, Bialowieza Forest, and the Wieliczka Salt Mine.

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37. Singapore - 230,000 Americans chose this city-state in southeast Asia for their vacation in 2015.

What to see: Gardens by the Bay, Botanic Gardens, Marina Bay, Chinatown, and the Singapore Zoo.

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36. South Africa - 230,000 Americans chose this southern African destination for their vacation in 2015.

What to see: Kirstenbosch National Botanical Garden, Cape of Good Hope, Constitution Hill, Kruger National Park, and the Apartheid Museum.

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35. Argentina - 262,000 Americans chose this South American destination for their vacation in 2015.

What to see: Tango shows, the Andes, Iguazú Falls, Buenos Aires (pictured), and Glaciar Perito Moreno.

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34. New Zealand - 295,000 Americans chose this destination in the southwestern Pacific Ocean for their vacation in 2015.

What to see: Queenstown, Milford Sound, Rotorua, Cathedral Cove, and Abel Tasman.

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33. Vietnam - 328,000 Americans chose this southern Asian destination for their vacation in 2015.

What to see: Halong Bay, Hanoi, Hoi An, Hue, Sapa, Nha Trang, and My Son.

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32. Hungary - 328,000 Americans chose this central European destination for their vacation in 2015.

What to see: Budapest, Lake Balaton, Eger, Sopron, Pecs, and Aggtelek National Park.

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31. Czech Republic - 328,000 Americans chose this central European destination for their vacation in 2015.

What to see: Prague, Cesky Krumlov, Kutna Hora, Karlovy Vary, Castle Karlstejn, and Telc.

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30. Brazil - 393,000 Americans chose this South American destination for their vacation in 2015.

What to see: Rio de Janeiro, Ouro Preto (pictured), Foz do Iguaçú, Salvador, Manaus, and Olinda.

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29. United Arab Emirates - 426,000 Americans chose this Arabian Peninsula destination for their vacation in 2015.

What to see: Sheikh Zayed Grand Mosque, Burj Al Arab, Abu Dhabi Falcon Hospital, Emirates Palace, and Etihad Antiques Gallery.

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28. Turkey - 426,000 Americans chose this eastern European/western Asian destination for their vacation in 2015.

What to see: Istanbul, Cappadocia, Ephesus, Bodrum, Side, Marmaris, Antalya, Konya, Mardin.

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27. Greece - 426,000 Americans chose this southeastern European destination for their vacation in 2015.

What to see: Greek Islands, Athens, Crete, Meteora, Delphi, Peloponnese, Halkidiki, Zagori.

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26. Thailand - 459,000 Americans chose this southeast Asian destination for their vacation in 2015.

What to see: Thailand Islands, Bangkok, Chiang Mai, Kanchanaburi, Ayutthaya, Khao Sok National Park.

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25. Austria - 459,000 Americans chose this central European destination for their vacation in 2015.

What to see: Schonbrunn Palace, Hallstatt, Grossglockner Alpine Road, St Anton am Arlberg, Innsbruck Altstadt, Hofburg Imperial Palace.

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24. Australia - 492,000 Americans chose this Oceanic destination for their vacation in 2015.

What to see: The Great Ocean Road, Kakadu National Park, Sydney Harbour Bridge, Flinders Ranges, the Great Barrier Reef.

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23. Peru - 492,000 Americans chose this south American destination for their vacation in 2015.

What to see: Machu Picchu, Cusco, Arequipa, Sacred Valley, Lima, Iquitos, Nazca Desert, Puno.

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22. South Korea - 492,000 Americans chose this east Asian destination for their vacation in 2015.

What to see: Gyeongbokgung Palace, N Seoul Tower, Namiseom Island, Lotte World, Bukchon Hanok Village.

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21. Taiwan - 557,000 Americans chose this east Asian destination for their vacation in 2015.

What to see: Jiufen, the Golden Waterfall, Yin Yang Sea, Mountain KeeLung, Maokong.

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20. Hong Kong - 557,000 Americans chose this east Asian destination for their vacation in 2015.

What to see: Ocean Park, the Big Buddha,  Happy Valley Racecourse, Wong Tai Sin Temple, Victoria Park.

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19. Israel - 557,000 Americans chose this Middle Eastern destination for their vacation in 2015.

What to see: Acre, Nazareth, Sea of Galilee, Golan Heights, Haifa, Tel Aviv, Jerusalem, Ramon Crater.

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18. Switzerland - 557,000 Americans chose this central European destination for their vacation in 2015.

What to see: Bern, Lucerne, Lake Geneva, Lugano, Jungfrau Region, Zermatt, Zurich, Geneva.

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17. Colombia - 689,000 Americans chose this south American destination for their vacation in 2015.

What to see: Cartagena (pictured), Tayrona National Park, Bogotá, Villa de Leyva, San Gil, San Agustin.

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16. Aruba - 689,000 Americans chose this Caribbean destination for their vacation in 2015.

What to see: Eagle Beach, Palm Beach, Donkey Sanctuary, Alto Vista Chapel, Antilla, Bushiribana Ruins.

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15. Ireland - 787,000 western European destination for their vacation in 2015.

What to see: Kylemore Abbey, Connemara National Park, Dublin, Slieve League, Gleniff Horseshoe, Mullaghmore Beach.

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14. Philippines - 820,000 Americans chose this southeast Asian destination for their vacation in 2015.

What to see: Hundred Islands National Park, Hinagdanan Cave, Chocolate Hills, Palawan Island, Manila.

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13. Netherlands - 820,000 Americans chose this northwestern European destination for their vacation in 2015.

What to see: Amsterdam, Leiden, Delft, The Hague, Maastricht, Utrecht, Haarlem, Groningen, Rotterdam, Gouda.

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12. Japan - 885,000 Americans chose this east Asian destination for their vacation in 2015.

What to see: Tokyo, Kyoto, Nara, Takayama, Nikko, Kamakura, Hiroshima, Kanazawa, Ishigaki, Koya-san.

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11. Costa Rica - 984,000 Americans chose this central American destination for their vacation in 2015.

What to see: Monteverde Cloud Forest Reserve, Arenal Volcano, Manuel Antonio National Park, Playa Jaco, Tortuguero National Park, Corcovado National Park.

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10. India - 1.08 million Americans chose this south Asian destination for the vacation in 2015.

What to see: Taj Mahal, Varanasi, Ellora Caves, Jaisalmer, Harmandir Sahib, Kanha National Park, Palolem.

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9. Bahamas - 1.12 million Americans chose this Atlantic island for the vacation in 2015.

What to see: Pink Sands Beach, Dolphins at Blue Lagoon Island, Paradise Island Water Park, Lucayan National Park, Port Lucaya Marketplace.

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8. China - 1.2 million Americans chose this east Asian destination for their vacation in 2015.

What to see: Great Wall of China, Potala Palace, Forbidden City, Victoria Harbour, Terracotta Army, Li River.

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7. Spain - 1.3 million Americans chose this southern European destination for their vacation in 2015.

What to see: Barcelona, Granada, Spanish Islands, Madrid, Seville, Valencia, San Sebastian, Cordoba, Toledo, Santiago de Compostela.

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6. Jamaica - 1.5 million Americans chose this Caribbean destination for their vacation in 2015.

What to see: Negril Beach and the Negril Cliffs, Martha Brae River, Dunn's River Falls, Blue and John Crow Mountains National Park.

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5. Germany - 1.77 million Americans chose this western European destination for their vacation in 2015.

What to see: Berlin, Munich, Neuschwanstein, Heidelberg, Lubeck, Dresden, Cologne, Romantic Rhine, Rugen Island, Leipzig.

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4. Italy - 2 million Americans chose this southern European destination for their vacation in 2015.

What to see: Rome, Tuscany, Venice, Pompeii, Amalfi Coast, Milan, Cinque Terre, Sicily, Italian Lake District, Naples.

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3. France - 2.36 million Americans chose this western European destination for their vacation in 2015.

What to see: Paris, French Riviera, Dordogne, Mont Saint-Michel, Luberon, Bordeaux, Loire Valley, Strasbourg, Lyon, Marseille.

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2. Dominican Republic - 2.8 million Americans chose this Caribbean destination for their vacation in 2015.

What to see: Punta Cana, Sosua, Bayahibe, Samana, Cabarete, Santo Domingo, El Limon Waterfall, Playa Rincon.

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1. United Kingdom - 2.9 million Americans chose this northwestern European destination for their vacation in 2015.

What to see: London, Scottish Highlands, Stonehenge, Edinburgh, York, Cornwall, Chester, Snowdonia, Lake District, Cambridge.

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