Pokemon Tower

The Pokémon Tower is a seven-story tower located in Lavender Town in the region of Kanto. On all seven floors, the tower houses hundreds of graves of deceased Pokémon. Many people visit the building daily to pay their respects to the fallen. On all floors other than the first two, though, the possibility of being attacked by wild Pokémon is present.

Gengar, Haunter and Gastly have all originated from Pokemon Tower.