i think its USA
the most popular transport for the tourists is air transport
Cancun is the most poular part of Mexico for tourists.
If you mean cities popular with tourists, I think they are Moscow, Saint-Petersburg and towns of The Golden Ring.
Aruba
Venezia is famous for being one of the most popular regions for tourists to visit in Italy. It is known for it's beautiful landscape and it's many hotels and restaurants.
Panama City
Miami is the most popular city in Florida. This is popular with both the residents and tourists. Hialeah is the second most popular city in Florida.
Rotorua. It has the most attractions and shows for tourists .
The most populous city in Europe is Moscow. The most popular city, meaning receiving the most tourists, is Paris.
France is the most popular country in Europe with about 80,000,000 tourists annually. France is also the most popular country in the world.
If the question is referring to tourists, asking what cities of Australia are most popular for tourists to visit, the answer is Sydney and Melbourne. This also happens to be the answer (coincidentally) if you are asking what cities in Australia are the most populous.