Time Out says
The Hiltl is the world's oldest vegetarian restaurant, with a buffet offering more than 100 dishes. The spacious premises include a bar, shop - and night club!
Founded in 1898, the Hiltl is – according to Guinness World Records – the oldest vegetarian restaurant in the world, and its famous buffet is filled with over 100 mouth watering dishes (à la carte dishes are also available, but most people prefer the buffet). The spacious restaurant spreads over two floors and has become a small vegetarian empire with its own bar, cooking classes, shop and even a night club. Try their fresh fruit juices, stuffed jalapeños and crispy onion rings!