Related Clues:

• Brimless cap
• Rotunda feature
• Frenchman's cap
• Top of the military?
• Soft hat
• Temple feature
• St. Peter's Church feature
• It's removed in Notre Dame
• Picasso's lid
• Artist's hat, perhaps
• Flat topper
• Capitol topper
• Buckminster Fuller creation
• Montmartre topper
• Taj Mahal feature