Crystal Lake Cave
- Discovered by a group of lead miners in 1868 and commercialized in 1932. Features half hour to 45-minute tour, hours, photographs and contacts.
- http://www.crystallakecave.com/

Dubuque River Rides
- Offering sightseeing and dinner cruises aboard the Spirit steamboat. Includes a photo gallery, rates and schedules, specialty cruises and related links.
- http://www.dubuqueriverrides.com/