American Safari tour guide Tad Pierson stands beside his 1955 pink Cadillac. Visitors to Memphis can get a personalized tour that highlights the city's rich music heritage. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR

Seasonal Ranger Mike Donahue (right) discuses the Battle of Little Bighorn with Jon Jones atop Custer Hill. Jim Kent/NPR hide caption

itoggle caption Jim Kent/NPR

Take a tour of the Hanford site, a nuclear production complex in Richland, Wash., and you'll see the hundreds of mechanical water pressure gauges wired to the process tubes inside the core. Tour guide Paul Vinther warns that bumping these gauges could throw off the readings enough to trigger a an emergency shutdown of the reactor. Martin Kaste/NPR hide caption

itoggle caption Martin Kaste/NPR

The Banjo Billy bus tour starts and ends outside the Hotel Boulderado, at the corner of 13th and Spruce streets. Banjo shares some haunting tales from previous (and possibly still-current) guests, particularly those on the third floor and inside the still-functioning Otis elevator. Courtesy of Vince Darcangelo hide caption

itoggle caption Courtesy of Vince Darcangelo