10 Works of Architecture That Reveal the Acrobatic Wonders of Concrete - Photo 3 of 10 - El Blok, a 22-room hotel in Vieques, Puerto Rico, strikes a unique profile. Its meandering shape features numerous cut-outs that let light in, casting playful shadows. The LEED Gold-certified property, designed by San Juan-based firm Fuster + Architects, shows the texture of the plywood boards that were used to create the building&#x27;s framework.