The rooftop bar at the impossibly trendy Tantalo Hotel has been one of the most happening nightspots in Casco Viejo since it opened in 2012. The large deck, strewn with dangling Edison bulbs, is anchored by a big rectangular bar with seating all around it. It's a primo spot to sip on a mojito and watch the world turn. The view of the modern skyline on one side and Casco's centuries of history on the other is incredible. There are events like live music, film screenings, or theme parties on most nights. The downstairs lounge, with its two-story green wall and art gallery, is also quite lively.