The Trapezohedron is a massive palace that was built on the outskirts of New York City in The Cancerverse an undetermined amount of time ago.
 
It is known primarily as The Revengers' base of operations but given its size and detail there can be no doubt that The Trapezohedron is so much more than a Cancerverse doppelganger of Avengers Tower.
 
So far The Trapezohedron's only known interior rooms are the laboratories of Tony Stark and Hank Pym and the adjacent interrogation room that comes complete with a superhuman containment cell.