A city is a place of tremendous variety, usually constructed upon rock ‘n’ roll. Plumb the secret depths of Denver with today's Groupon: for $10, you get one adult ticket to Banjo Billy's Bus Tours (a $20 value). Your Groupon is good for any of the Denver tours, but is not valid for private tours or ghost tours in October.

During the 90-minute sightseeing trip, engaging tour guides regale bus patrons with historical tidbits, ghost stories, and true-crime chronicles. Learn the story of Molly Brown and how the city was within a few votes of being named Denversaurus Rex as you amble through the city in Banjo Billy's ramped-up, rehabbed bus. Reminiscent of a backwoods shack on wheels, the bus's interior features a psychedelic canopy, funky lighting, and a disco ball. The original bus seats were removed and replaced with comfy couches, recliners, and saddles to effectively kick up the kicked-back vibe. Seating is first-come first-serve, so arrive at least 10 minutes in advance to claim your preferred seat.

Start your journey by meeting up at the Colorado Convention Center by the Big Blue Bear. Tours usually start at 1 p.m. and 3 p.m. throughout the year, but check the ticket page for the most up-to-date tour information. Use your Groupon to book your trip online, or call ahead to make reservations for friends, family, and well-behaved stuffed animals.

Reviews

Banjo Billy's Bus Tours gets 4.5 stars from 12 Yelpers, with 11 TripAdvisors giving it four owl eyes:

• We took the Boulder tour, and had a thoroughly enjoyable afternoon. – Donnasdreams, TripAdvisor
• The hosts were very friendly and had the best sense of humor. – colomtngrl1136, TripAdvisor
• Great way to learn about Boulder or Denver and certainly the perfect way to entertain out-of-town guests for a couple of hours. – H.B., Yelp