As developer Bill Struever shows off his latest endeavor in Baltimore, he can't help but linger by the pool. The 2,400-square-foot oasis majestically rises from the ruins of an 1800s-era manufacturing building that burnt to the ground in the late 1990s. Exposed brick ruins surround the pool and serve as a link to the past while cast-iron columns—left over from the construction of the U.S. Capitol Building, no less—are capped off by gas torches that illuminate the pool at night.