You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: AMERICAN NOVELISTS 
Clue: "What is moral is what you feel good after and what is immoral is what you feel bad after", he wrote in 1932
ernest hemingway

Category: ANCIENT HISTORY 
Clue: Circled 7 times by the Israelites in Joshua, it's said to be the world's oldest walled city
jericho

Category: FAMOUS STRUCTURES 
Clue: In 1930 the Chrysler Building surpassed this foreign structure by over 60 feet to become the world's tallest

the eiffel tower