Related Clues:
- It keeps grass dry in a stadium
- Decay reported beneath the Pantheon, for example
- Downward-facing concave shape
- Building showing decay beneath, we hear
- Stadium feature, maybe
- Circular roof
- There's a famous 'half' one in Yosemite National Park
- Top of the Capitol Building
- Planetarium feature
- Decay, reportedly beneath and round building
- Building over frozen soil sees river rising
- High point of St Peter's Basilica
- Rounded part of a building
- Tokyo ___ (stadium that hosts the Yomiuri Giants)
- Stadium's rain blocker