Gordon Strong Automobile Objective — Wikipedia

The Gordon Strong Automobile Objective was a proposed planetarium, restaurant, and scenic overlook designed by American architect Frank Lloyd Wright for the top of Sugarloaf Mountain in Maryland. Wright developed the design in 1925 on commission from Chicago businessman Gordon Strong. A spiraling ramp featured centrally in Wright's plan; this was his first use of a feature which would later gain fame as part of his Guggenheim Museum in New York.