4345 Tennyson St. Denver, CO 80212 Phone No. 303-455-2855 http://www.mammothamerican.com/ Art Gallery, Artist, Tattoo Shop Mammoth American is a professional custom tattoo studio and art gallery located on Tennyson St. in the Highlands of Denver Colorado. Owner and artist William Thidemann has brought together the talents of Matt Hays and Michael Martinez in conjunction with his own to provide the highest quality tattoos. Specializing in a wide variety of styles and unparalleled customer care, we take pride in giving... read full review »