Places

Gloomy Manor
This mansion is the first in the game and where Luigi gets the Poltergust 5000, encounters the basic ghosts, and finds the first possessor. This is the only mansion that is actually a mansion.There are a bunch of web burning puzzles here. It is styled after a Victorian era manor.The first Poltergeist appears here. "I, Professor Elvin Gadd, had been observing the ghosts living in this Gloomy Manor, when suddenly the Dark Moon broke into pieces, and the ghosts got all hostile-like!" -mansion blurb

Haunted Towers
These towers used to be a mansion before a giant tree grew in the middle of it.The owners were okay with that though and build rooms inside of it! It is infested with flytraps, purple flowers, bean stalks, sprouts, and spiky fruit. This is the area where the first Gobbers, Sneakers,Hiders,and the Polterpup appear .It is also the first mansion not to have a Poltergeist mini boss fight."These remarkable towers are built around a colossal tree.The original owners had a liking for gardening and exotic plants, which are growing out of control!" -mansion blurb

Old Clockworks
It is built over a ancient burial cite. It has a lot of clock puzzles of changing the time on the hands or number. It is where the Ancient Poltergeist is encountered and Mummy Greenies. Also the first strong ghost is encountered here. "This factory once produced the world's finest clocks and time-measurement devices. Your watch probably comes from here, and you don't even know it!" -mansion blurb

Secret Mine
In this "mansion" in the snowy mountains, you are introduced to strong ghosts even though one was in the mansion before. (see above) It is the second "mansion" to have a non-Poltergiest mini boss. There are a bunch of ice puzzles and the ice physics aren't that bad. Also Paranormal Chain Ghosts make their first and only appearance here. It is the only mansion to have only 4 missions. "Some determined geologists started a mining operation in these snowcapped mountains. But when ghosts started moving in, they got scared and abandoned it!" -mansion blurb

Treacherous Mansion
Dispite the name it isn't actually a mansion. It's more of a museum .It is in the middle of a chasam and could fall any second (even though this never happens).You finally catch that dang Polterpup here and fight the Strong Poltergeist. It's the only mansion to have two mini bosses (Big Boo and Strong Poltergeist). It also houses the infamous Paranormal Chaos misson. "This massive mansion is filled with exotic exhibits created by it's globe-trotting owner. Oh, and it also contains the strongest paranormal signals ever recorded!" -mission blurb.

Trivia
The first letter of each "mansion"'s name spells G-H-O-S-T.This is also true the the possesses and the bonus missions.