The Colonnade Hotel, 120 Huntington Avenue, Boston 02116, MA, USA

The only hotel in Boston with a roof top swimming pool, The Colonnade's pool has been acclaimed as an oasis in the middle of the city, and described as "the best reason to call in sick".

With captivating views of the Boston cityscape, the pool area is an exquisite spot to enjoy the sunshine, rejuvenate the senses with an invigorating swim or simply somewhere to sip a cocktail or dine al fresco.

The pool is open daily (weather permitting) between 8am and 8pm.  Free to hotel guests, the pool is also open to non-residents Monday-Friday for a flat-rate of $25 per day.

Hotel website:  The Colonnade 

Majestic Hotel, Passeig de Gracia, 68 08007 Barcelona, Spain

A grand five-star affair in the heart of Barcelona, The Majestic boasts spectacular views from its roof top terrace.  Here, guests can soak up the sun, people-watch on Passeig de Gracia below, and of course, enjoy a swim in the roof top pool.

The hotel is within easy reach of the city centre, and most of the sights are within walking distance.  La Rambla is 10 minutes away, and the Gothic Quarter is just a 20 minute stroll. 

With 303 rooms, including 30 suites, The Majestic is certainly one of the best luxury hotels in Barcelona, with all the amenities one would expect from a top five-star.

Hotel website:  The Majestic