Paris Coture, a recent addition to the Paris 1900 region, has two multimedia installations which I very much enjoyed visiting last night.
The first is Ghost Train by Patrick Moya, a frenetic cab ride through some very well done art displays keeping with a Halloween haunted theme. You can visit it here.
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Right around the corner is a kinetic multimedia installation by Fuchsia Nightfire which I found mesmerizing. Make sure to have your media (camera icon) and sound up when you visit:
While you are at it explore the Paris Couture sim which has more galleries and a very nice carousel, along with other Halloween-themed places to visit. The neighboring Eiffel Tower and Belle Epoque architecture makes Paris 1900 a very pretty place to visi.