What doesDBB mean in tourism?

Why dams are made wider at the bottom? River whose source lies near rohtang pass? What layer does galagos live in forests? What is the nearest train station to Alton towers? What are the different names of ganga? Is London bridge a Victorian building? What is the height of the bridge at newtown road ashford kent? What two river run westward and feed into the Columbia river? Which North Eastern State for a large ca which north eastern state forms a large Kate cape into the Atlantic Ocean? How do you get from union station Chicago to field museum? When was the Liberty Bell last rung? What is the Distance across Lake Erie from Cleveland Ohio to Canada? How many workers were involved in the Hoover Dam? Why can't plants grow on mount Everest? What is the sea of northern Europe? Are there any sharks in Robert moses beach? Truck driving route from Baltimore to Maine? How do you do a plot roller coaster for a book report? What are three of the medieval castles names? How did the Huron's transport?