You need the flying broom to enter the attic, where the chalice is hidden. Go into the room with the Cupid statue, and click on the spider. It will drop in front of the haunted painting of the...
you go above the chandiler in the room with an angel in it.
You have to press on the spider.(At the top) It would scare the witch and she will drop the broom!
Poptropica Towers is the area in the far left of the island.
It was a name thought up by Jeff Kinney and the creators of the concept, with the vague connotation of a "tropical" island setting.