The Enormous Room

"The Enormous Room" by H. L. Gold is a science fiction story from the 1950s about people trapped in an alien lab after a roller coaster accident. The main character is John Summersby, a forest ranger, and other kidnapped people, including a couple just married. They wake up in a strange room after passing out on a roller coaster, filled with weird things and trees. They understand they're trapped by huge aliens who act like kids playing with dangerous toys. An alien with a green rod shows up and starts moving them around. This sets the scene for a suspenseful adventure where they face aliens and try to figure out why they're captured.