buckingham palace is the biggest attraction in london
Your mom is the biggest.
Edinburgh Castle
The forbidden city
Cincinnati stadium
Hollywood and Disney Land.
It is Cancun, on the Yucatan peninsula.
The Falkirk Wheel
Black Sea resorts
The Alamo or Space Center Houston
The London Eye or the Buckingham Palace. :)
That's an opinion. But in my opinion is Nasa, its in Houston.