list some of the most well-known and highly regarded UNESCO World Heritage Sites that are often considered among the top 50. Please note that this list is not exhaustive and is in no particular order:
Great Wall of China (China)
Taj Mahal (India)
Machu Picchu (Peru)
Petra (Jordan)
Pyramids of Egypt (Egypt)
Acropolis of Athens (Greece)
Colosseum, Rome (Italy)
Angkor Wat (Cambodia)
Stonehenge (United Kingdom)
Statue of Liberty (United States)
Great Barrier Reef (Australia)
Galápagos Islands (Ecuador)
Yellowstone National Park (United States)
Serengeti National Park (Tanzania)
Grand Canyon National Park (United States)
Vatican City (Vatican)
Historic Centre of Florence (Italy)
Iguazu National Park (Argentina and Brazil)
The Palace of Versailles (France)
Chichen Itza (Mexico)
The Alhambra (Spain)
Great Smoky Mountains National Park (United States)
Mont-Saint-Michel and its Bay (France)
Cappadocia (Turkey)
The Great Mosque of Cordoba (Spain)
Bagan (Myanmar)
Easter Island (Chile)
Machu Picchu (Peru)
Historic Centre of Prague (Czech Republic)
Venice and its Lagoon (Italy)
Wonders of the Classical Era (Italy and Greece)
Wonders of the Modern Era (USA, France, Brazil, China, United Arab Emirates, and India)
Historic Centre of Mexico City and Xochimilco (Mexico)
Historic Centre of Vienna (Austria)
Historic Centre of Saint Petersburg and Related Groups of Monuments (Russia)
Redwood National and State Parks (United States)
Mount Athos (Greece)
Old City of Jerusalem and its Walls (Israel)
Wieliczka and Bochnia Royal Salt Mines (Poland)
Serengeti National Park (Tanzania)
Komodo National Park (Indonesia)
Rock-Hewn Churches of Lalibela (Ethiopia)
Wulingyuan Scenic and Historic Interest Area (China)
Hiroshima Peace Memorial (Japan)
Historic Centre of Rome (Italy)
Old City of Dubrovnik (Croatia)
Machu Picchu (Peru)
Petra (Jordan)
Bwindi Impenetrable National Park (Uganda)
Historic Centre of Istanbul (Turkey)
Please keep in mind that the list above is a mixture of cultural, natural, and mixed UNESCO World Heritage Sites, and there are many more incredible sites around the world that are equally deserving of recognition. To get the most current and official list of World Heritage Sites, I recommend visiting the UNESCO World Heritage Centre website.