sentence1: Key features are the horseshoe-shaped staircase (Escalier du Fer-? -Cheval) at the end of the stately Cour du Cheval Blanc; the Renaissance ballroom whose ornate ceiling is reflected in the parquet floor; and the allegorical paintings in the Galerie Francois Ier.
sentence2: The horseshoe shaped staircase is very large and imposing.