What’s the strangest place you’ve ever been to?

Sometimes, due to certain life circumstances, you end up in strange, shady, dark, or simply unfamiliar places—perhaps because you got lost and took a wrong turn, boarded the wrong vehicle, or accompanied a friend or someone else to a place you didn’t know. The question is: have you ever been to a place like that? If so, how strange or unusual was it? What made it different or noteworthy compared to the places you frequent?