Related Clues:

• Semicircular tops
• Round tops
• Places for toupees
• Mosque features
• Spherical roofs
• Some arena covers
• Round roofs
• Features of some stadiums
• Some stadium covers
• Yosemite rock features
• Stadium enclosures
• They're over rotundas
• Rotunda tops
• Mosque toppers
• Igloos, essentially