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Halcyon's Mansion is the home of Greek demigod Halcyon Green and was seen in The Demigod Diaries.

Appearance

The door is heavily enchanted and the drapes are deadly sludge that creeps up anything that touches it.

The Heroes of Olympus

The Demigod Diaries

The Diary of Luke Castellan

Thalia Grace and Luke Castellan discover the mansion while being lead there by Amaltheia.

RealHal

Halcyon Green, who owned the house before it was destroyed.

Locations (CHB)
Magical Locations: Olympus | Camp Half-Blood | Camp Jupiter | Aeolia | C.C.'s Spa and Resort | Daedalus' Workshop | Lotus Hotel and Casino | Mount Othrys | Ogygia | Pan's Cave | Sea of Monsters | The Labyrinth | Tartarus
Cities, States, and Towns: Alaska | Bar Harbor | Chicago | Detroit | Gila Claw | Jamestown | Long Island | Manhattan | New York City | Quebec | San Francisco | Vancouver | Westport
Other Locations: Apennine Mountains | Aunty Em's Gnome Emporium | Crusty's Water Bed Palace | Empire State Building | Gateway Arch | Grand Canyon | Greece | Hoover Dam | Junkyard of the Gods | Mount Saint Helens | Polyphemus' Island | ROFL | Rome | Triple G Ranch | Waterland | Mount Etna | Mount Diablo | Mount Tamalpais | Pikes Peak