The Home Insurance Building in Chicago (completed 1885, designed by William Le Baron Jenney) is widely considered the first skyscraper. Its revolutionary structural steel frame, though initially supporting masonry cladding, laid the foundation for modern high-rise construction by demonstrating that a building's height was no longer limited by the thickness of its base walls.

The Chrysler Building in New York City (completed 1930), designed by William Van Alen, is an iconic Art Deco masterpiece. Its gleaming stainless-steel terraced crown features stylized sunburst motifs and gargoyles resembling Chrysler automobile hood ornaments, perfectly capturing the era's fusion of luxury and industrial enthusiasm.

Ludwig Mies van der Rohe's Farnsworth House (completed 1951) is a seminal work of the International Style. Its pure, minimalist form—essentially a single transparent glass room floating above the ground on eight white steel columns—perfectly embodies his principle of "less is more."

Michael Graves' Portland Building (completed 1982) is a defining monument of Postmodernism. Its blocky, monolithic massing is adorned with oversized, stylized keystones, flat pilasters, and a vibrant color palette, completely rejecting the sleek, glass-box aesthetic of the preceding decades.

A late 20th-century museum is characterized by sweeping, chaotic, non-rectilinear titanium curves that seem to defy structural logic, appearing almost like a crumpled piece of metal.