For couples seeking a vibrant, sexy vacation, Barcelona is a wonderful destination, filled with inviting tapas bars and colorful nightlife. These 20 hotels -- from a Gothic Quarter oasis with interiors dating back to the first century to a wine-themed boutique hotel in Eixample -- are romantic destinations in their own rights. With features like Michelin-starred restaurants, chic rooftop lounges, and atmospheric grotto pools, these hotels are the most romantic in all of Barcelona.