Square Mile, London, England
Rooftop: The Skylounge With its edgy architectural themes, dramatic panoramic views, and central location, the Doubletree - Tower of London is a convenient and stylish pick. The 583-room hotel offers sleek, minimalist design with perks like iMac TVs -- both a computer and a TV -- and free Wi-Fi. But the Skylounge, a rooftop bar with sweeping views over East London, is one of the hotel's most striking features. This destination bar with floor-to-ceiling windows and a rooftop garden offers cocktails complimented by panoramic views of some of London's most iconic architecture, including the medieval Tower of London, the modern Gherkin building, and St. Paul's Cathedral.