More like The Time Entity Trilogy

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A Tale of Time CityNovel
Diana Wynne Jonesstandalone novel1987
Adventurous in tone, about quests and coming of age, set in early 20th century.
“In 1939 an eleven-year-old London girl is kidnapped to Time City, a place existing outside the stream of time and manipulating the history of humanity, where she finds the inhabitants facing their worst hour of crisis.”
from the catalogue
Six Gates from LimboNovel
J. T. McIntoshstandalone novel1968
About amnesia and survival.
“Awakening in a grassy clearing, a man with no tools or weapons, no name, no memory, begins to explore his world.”
from the catalogue
A Red Sun Also RisesNovel
Mark Hodderstandalone novel2012
Portal fantasy, about gods, set in secondary world and islands.
“Fleisher and Stark meet the native Yatsill, consummate mimics who construct an elaborate society based on Victorian London, using details mined from the thoughts of their new visitors.”
from the catalogue
PiranesiNovel
Susanna Clarkestandalone novel2020
Fantasy, about amnesia and identity.
“A man lives in a huge isolated labyrinthine building partially submerged in an ocean, together with another man and 13 skeletons, which is the only world he recalls.”
from the catalogue
Captive UniverseNovel
Harry Harrisonstandalone novel1969
About survival and identity, set in far future and underground & caves.
“Chimal is an Aztec farmer's son in an isolated valley cut off from the world by a landslide generations back, split between two villages that live under strict, ancient law enforced by priests.”
from the catalogue
Inverted WorldNovel
Christopher Prieststandalone novel1974
Challenging in tone, about survival, set in secondary world.
“A city travels slowly along tracks laid by the residents ahead of the city and pulled up from behind the city, through territory where other people live.”
from the catalogue