The Curse of Strahd Campaign.
I have bad memories of this Campaign, especially with Strahd's house. a real hell to go through.

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Tell me about it. My Party got TPKed in our Campaign (no, that is not a spoiler for this series).

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to resum
we: were attacked by a group of gargoyles who took a good part of our HP
sent to several random rooms of the castle that our group was separated into two groups.
finding the room where Strahd was by pure (bad) luck.
come across a trap that leads us to a cell in the dungeon.
accidentally released a werewolf
find a lot of money, weapons and magic items.
almost getting killed several times.
rebuild a special anti-vampire weapon. which we have never been able to successfully hit Strahd with.
achieve an instant kill on Strahd with an alchemy book that did nothing to him. (but it was really epic and really funny)