Does Chicago have tunnels?

Related questions

1. What is considered South Side of Chicago?
2. How did they raise Chicago?
3. Why did they raise the streets in Chicago?
4. Was Chicago built on a swamp?
5. Who named Chicago?
6. Why is it called Chi town?
7. Is Uptown Chicago Safe?
8. How much does it cost to live in Chicago?
9. Is Chicago sinking?
10. Does Chicago have an underground city?

Tags

1. #cross
2. #tunnels
3. #theaters
4. #lesser
5. #conditioning
6. #network
7. #offered
8. #freight
9. #hotels
10. #train
11. #lines
12. #criss
13. #beneath
14. #natural
15. #tunnel
16. #abandoned
17. #known
18. #elevated
19. #chicago
20. #century