Family Membership, Observer & 2 passes to Observatory (Observatory is open Memorial Day thru Columbus Day) Greater Portland Landmarks promotes preservation and revitalization of historic buildings, neighborhoods, and landscapes and encourages high-quality new architecture to enhance the livability and economic vitality of Portland and surrounding communities. Greater Portland Landmarks has worked since 1964 to increase the public's awareness of and appreciation for greater Portland's remarkable built environment. Through educational programs, hands-on workshops, demonstration projects, research, and outspoken advocacy, Landmarks has come to be described as the "architectural conscience" of greater Portland.