Did vikings live in castles

Who ordered the construction of the Colosseum building? What are facts about the river Po? What is lake tanganyika? What state has the most lake shore mileage? What special problems might an animal face if it lives under sand or mud? What do you think of the plan to build a bridge of boats? Where is the Walter Anderson Museum Of Art in Ocean Springs Mississippi located? What animals live in the Sonoran Desert? Where do you find the blue bird in endless ocean blue world? What are the four types of rainforest habitats? The formation of sand dunes by wind is an example of? Which countries have rainforest? Where is the gulf of sidre? Does the Columbia river run through Utah? What is the most famous tourist attraction in the world? What is the history of the machu picchu? How much does the Notre Dame cost? How much money charged at zoos actually go to saving the animals? How do the world's oceans rank in size? What is a Mediterranean scrub?