Related Clues:
- Construction spot
- Yogi, for one
- Internet destination
- Scavenger at Yellowstone
- Yellowstone denizen
- Really tough test, informally
- Construction location
- Stop online
- Web ___
- ___-specific (like the answers at 1-, 41- and 73-Across)
- Cyberspace spot
- Building __
- Killer of an exam
- With 27-Across, it collapsed in 2008
- Really tough task