Is it a restaurant? A bar? A club? Actually, GEM Boston is a bit of all three. This unique Financial District gastro-lounge/supper club features a swank interior inspired by Hotel Costes in Paris, with an intimate dining room and a charming bar. The drink menu includes its fair share of carefully balanced martinis and cocktails, while the food menu — handled by Chef Kevin Long and described as American tapas — is far beyond what you'd find at most bars, to the point that many show up here just for dinner. With the ambiance switching from lounge to dance club at night, this is one spot where you can come for a late dinner and not need to leave until closing time.