
Since 1975, the Rotterdam-based Office for Metropolitan Architecture has produced some of the world's most provocative buildings. Led by Rem Koolhaas and his nine partners, the firm's most notable built projects include seminal works such as the CCTV Headquarters in Beijing, the Seattle Central Library, and Casa da Musica in Porto, Portugal. Known as one of the world's leading creators of boundary-pushing design, OMA's influence on the global architectural landscape is undeniable.
Among the firm's several hundred realized projects, however, many lesser known proposals were drafted but never constructed. Arguably a fundamental component of the OMA's practice, the unbuilt projects contain some of the firm's most outlandish and important ideas with incredible potential to influence architectural design worldwide. As a tribute to Koolhaas and OMA's continued pursuit of the unconventional, we've rounded up fifteen of OMA's most unusual unbuilt skyscrapers. Read on to find out which ones made the list.









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