Dolphinarium

From Tardis Wiki, the free Doctor Who reference
The Eleventh Doctor hiding behind a copy of The Beano Summer Special 1981, featuring Dolphinarium.

Dolphinarium was a fictional swimming pool seen in The Beano.

The Beano Summer Special 1981's front and back cover featured various characters at Dolphinarium. Dennis the Menace and a black dog were seen above the pool. (TV: The Rings of Akhaten)