This Art Nouveau Spanish club, with its high, gilded ceiling and grand pillars, bas-relief artwork, and original Spanish paintings, boasts the most magnificent dining room in Buenos Aires. Despite the restaurant's architectural grandeur, the atmosphere is surprisingly relaxed and often celebratory; don't be surprised to find a table of champagne-clinking Argentines next to you. Tables have beautiful silver place settings, and tuxedo-clad waiters offer formal service. Although the menu is a tempting sample of Spanish cuisine -- including the paella and Spanish omelets -- the fish dishes are the best.