Gravity Research Foundation Monument Portal in Centerville Massachusetts United States
| # | Image | Mod | Area | L | R | HP | Days |
|---|---|---|---|---|---|---|---|
| 1 |  Gravity Research Foundation Monument | -- | 1 | 0 | 0% | 145 | |
| 2 |  Gravity Research Foundation Monument | -- | 7 | 8 | 10% | 63 | |
| 3 |  Gravity Research Foundation Monument | -- | 1 | 1 | 20% | 63 | |
| 4 |  Gravity Research Foundation Monument | -- | 1 | 0 | 0% | 65 | |