Yep. HOTEL CASANUS. "On a small island nestled between Antwerp and Ghent in Flanders, Belgium lies what could be the most remarkable hotel ever.  Shaped like a giant anus, Hotel CasAnus just screams, stay inside me!"

I said what, what? In the butt.

"Spend the Night in a Giant Anus". [ripleys.com, thanks Theremina]