Carboniferous forest display entrance

One of the more hidden exhibitions in the zoo,I missed these on my first visits

These are the former bear dens? Good thing they were turned into salamander terrariums, they were already pretty small for me, can't imagine bears living in them...
@ralph I luckily got it on my first (and unfortunately only) visit!

Where in the zoo is this located?

If memory serves me right, close to the Tropical "Z" Pavilion and close to the New Zealand exhibit.
@Rafiaan

Thanks a lot.