Text: On of the best times to see the square's architecture is in the winter, when the chestnut trees are bare and don't obscure the pink brick and honey-colored stone faaades.
Entailment: In the winter, when the chestnut trees are bare and don't obscure the pink brick and honey-colored stone facades--that is one of the best times to see the square's architecture.
Contradiction: The best time to see the square's architecture is in Autumn, when the square's architecture is not obstructed by throngs of tourists.