Watercolor and pen and ink paintings by Mark Oliver are featured in “Lambertville Locations,” on view through the end of August at Bell’s Tavern, 183 North Union Street, Lambertville.  Oliver is a practicing architect with a passion for the built environment, and his paintings examine the urban landscape of everyday places. Lambertville provides him with unique and colorful subjects for his compositions.  He is a member artist at Artists’ Gallery, 18 Bridge Street, Lambertville, where his work is always on display.