Arsenic is Lausanne's contemporary performing-arts house, with a programme that leans toward dance, theatre, performance, and experimental stage work. It is the sort of venue that shows the city's sharper cultural side, away from the lakefront promenades and museum circuit.
For most travellers it is worth adding only if the calendar lines up with your stay. When it does, Arsenic is a good evening choice: informal, current, and more rooted in Lausanne's local creative scene than the polished tourist-facing parts of town.