From office buildings to prisons to Mars settlements, what do we think about when we design spaces? How does planning influence urban society in the past, present, and future? All of these questions and more are ripe for exploration thanks to the YouTube channel of Columbia University's Graduate School of Architecture, Planning, and Preservation (GSAPP). Most videos are recordings of live events such as lectures, panels, and presentations by faculty, students, and special guests. The most popular videos exemplify the breadth of cross-disciplinary content Columbia GSAPP offers, including talks from fashion designer Virgil Abloh (see the "Spring 2017 Core Lecture Series" playlist) and international architect Bjarke Ingels (see the "Spring 2020 Lecture Series" playlist), as well as a profile of 20th-century Turkish-Armenian brothel owner and real estate investor Matild Manukyan (see the "Studio-X Istanbul" playlist). Viewers can find the most popular videos by clicking the "Sort by" button on the right side and selecting "Most popular." Do not miss the recent four-part series of panels, "Planning Futures? On Decolonial, Postcolonial, and Abolitionist Planning" or the video "Space Settlements," a conversation about architecture in outer space. Historical preservation enthusiasts should check out the "Stonewall 50: Defining LGBTQ Site Preservation" panel (available in three videos from April 15, 2019). The channel hosts a decade's worth of more than 1200 videos, with more added weekly.