Do you guys think that there should be a wiki about mysterious places in the games/anime? They don't nessecarly need to be connected with legendary Pokémon, they may not even have any Pokémon in them, but they were programmed into the game for reasons that aren't completely obvious to the player. These places may end up being connected to internet rumours (Go here, do this and X will appear.)
Places that could qualify in the games:
Gen I
Mt.Moon
Seafoam Islands
Cerulean Cave
Pokémon Tower
Pokémon Mansion
Gen II
Ruins of Alph
Ilex Forest (particularly the shrine)
Burned Tower
Tin Tower
Mt.Silver
Dragon's Den
Lake of Rage
Gen III
R/S/E
Sealed Chamber (and the associated ruins that house the Regi)
Scorched Slab
Mirage Tower
New Mauville
Sky Pillar
Seafloor Cavern
Altering Cave (Hoenn)
Cave of Origin
Mt.Pyre
Southern Island
Faraway Island
Marine and Terra Caves
FR/LG
Mt.Ember
Dotted Hole
Lost Cave
Pattern Bush
Altering Cave (Sevii)
Tanboy Ruins (and the Tanboy Key)
Outcast Island
Navel Rock
Birth Island
Gen IV
All three lakes and the caves that house the lake trio
Sendoff Spring
Old Chataeu
Lost Tower
Soleaceon Ruins
Spear Pillar
Snowpoint Temple
Turnback Cave
Stark Mountain
Ruined World
Fullmoon Island
Newmoon Island
Seabreak Path
Flower Paradise
Hall of Origin
Places that could qualify in the games:
Gen I
Mt.Moon
Seafoam Islands
Cerulean Cave
Pokémon Tower
Pokémon Mansion
Gen II
Ruins of Alph
Ilex Forest (particularly the shrine)
Burned Tower
Tin Tower
Mt.Silver
Dragon's Den
Lake of Rage
Gen III
R/S/E
Sealed Chamber (and the associated ruins that house the Regi)
Scorched Slab
Mirage Tower
New Mauville
Sky Pillar
Seafloor Cavern
Altering Cave (Hoenn)
Cave of Origin
Mt.Pyre
Southern Island
Faraway Island
Marine and Terra Caves
FR/LG
Mt.Ember
Dotted Hole
Lost Cave
Pattern Bush
Altering Cave (Sevii)
Tanboy Ruins (and the Tanboy Key)
Outcast Island
Navel Rock
Birth Island
Gen IV
All three lakes and the caves that house the lake trio
Sendoff Spring
Old Chataeu
Lost Tower
Soleaceon Ruins
Spear Pillar
Snowpoint Temple
Turnback Cave
Stark Mountain
Ruined World
Fullmoon Island
Newmoon Island
Seabreak Path
Flower Paradise
Hall of Origin