Gallery O on H Street in Washington, D.C.

From the outside, Gallery O on H looks like an unassuming row of Washington, D.C. houses. But behind their ordinary facades lies a series of interconnected galleries, courtyards, and unexpected spaces filled with an extraordinary collection of art, unusual objects, and pieces of forgotten history. For more than 15 years, this unconventional art space has been part of the city's H Street corridor.