Anchor: To know its every crook and cranny is a daunting challenge, but concentrate on the ancient city around the Colosseum or the Vatican's formidable complex, and come to know one age at a time.
Entailed: The city is vast so you can't visit every nook and cranny. 
Contradiction: You absolutely can visit every part of the city. 
Contradiction: A boy plays inside.
Contradiction: A girl photoboms a pastoral.
Contradiction: The woman was building sand castles in the dirt.
Contradiction: Bicyclists are riding on the Golden Gate Bridge.