This image shows  customers gaining entry to the old-style attraction known as Curious Canyon in its early days, and now known as the Mystery Spot.
There is no description on the back of this card. Its is typical of the unposed photos that were printed on postcard stock as souvenirs for customers. To the left is the exit to the attraction, with the sign “I Just Saw Curious Canyon”. Possibly, visitors could have their pictures taken there as a souvenir as well.
This postcard likely dates from the 1940s.