Related Clues:

• Raise (an eyebrow)
• Pride of St. Louis?
• Hump
• Curved part of a foot
• St. Louis's Gateway __
• Curved entrance
• A good shoe supports it
• Roman monument to Constantine
• It could fall on a foot
• Vault feature
• Viaduct feature
• ''Duke'' starter
• Impressive entrance
• Tongue-in-cheek
• Design feature of many a viaduct