Witch Museum Is This?

One summer, now many years ago, I had the personal goal of visiting every museum in Budapest. At that time, there were forty-five that were advertised through the TourInform offices. I actually made it to thirty-five of them. The ambulance and funeral directors museums went on the back burner. 
During my walk to the post office, I just accidentally came across this museum, which I have to visit; I know it will be enchanting. I would have gone in while I was here, but it was closed. It must only be open during new and full moons. Regardless, I am sure it will have some spell binding goodness. I am trying to get eleven others to join me for a visit, so we can coven (covet) the experience.
A dark Cave. In the middle, a Caldron boiling. Thunder.
Enter the three Witches.

1 WITCH.  Thrice the brinded cat hath mew’d.
2 WITCH.  Thrice and once, the hedge-pig whin’d.
3 WITCH.  Harpier cries:—’tis time! ’tis time!
WITCH 1 –  Round about the caldron go;
In the poison’d entrails throw.—
Toad, that under cold stone,
Days and nights has thirty-one;
Swelter’d venom sleeping got,
Boil thou first i’ the charmed pot!
ALL.  Double, double toil and trouble;
Fire burn, and caldron bubble.