Central Park is public park in Manhattan, New York City. The Door of Orpheus, an entrance into the Underworld, is located here.
Percy Jackson and the Olympians

Grover, the satyr who slept in Central Park for several months.
The Last Olympian
While spreading the word of Pan's death and trying to recruit nature spirits for the impending war, Grover is knocked unconscious by Morpheus. He is asleep for several months and is awoken with his Empathy Link when Percy Jackson and Nico di Angelo search for the second entrance to the Underworld. Once he is awake he explains why he was in Central Park to begin with and then opens the entrance to the Underworld with his reed pipes.
The Kane Chronicles
The Red Pyramid
When Carter and Sadie Kane are escaping the attack on Brooklyn House and running from the carriers, they run into Central Park and narrowly escape Sekhmet when the scorpion goddess attacks them.
City of the Plague God
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Not part of Riordanverse
The following article/section is from the City of the Plague God continuity under Rick Riordan Presents and not the Riordanverse canon. |
Gilgamesh's magic-hidden seven tier glass ziggurat with an iron frame and gardens is located within Central Park. Sikander and Belet evaded Asakkus and sought sanctuary here at Ishtar's preparations. During Nergal's infestation of Manhattan, the glass ziggurat was destroyed and Sikander discovered Gilgamesh hidden under his pile of vines and shrubbery.