Courses from 1000+ universities
$7.2 billion in combined revenue since 2020. $8 billion in lost market value. This merger marks the end of an era in online education.
600 Free Google Certifications
Computer Science
Psychology
Microsoft Excel
Lean Production
Viruses & How to Beat Them: Cells, Immunity, Vaccines
Learn Like a Pro: Science-Based Tools to Become Better at Anything
Organize and share your learning with Class Central Lists.
View our Lists Showcase
Explore the dark history of Bethlehem Steel's working conditions, from its rise as an industrial powerhouse to its impact on workers' lives and eventual downfall in American manufacturing.
Discover the fascinating story of Alfred Ely Beach's 1870 pneumatic subway beneath Broadway—a revolutionary transit system powered by air pressure that was ultimately shut down by political corruption.
Explore the fascinating history of St. Louis' standpipes—towering water pressure regulators that became architectural monuments while similar structures were demolished elsewhere. Discover why these industrial relics still stand today.
Explore the secrets of the Pentagon—America's largest low-rise office building with hidden tunnels, classified areas, and a complex design built for military command. Discover why this five-sided fortress remains largely off-limits.
Discover how the Lincoln Highway, America's first transcontinental road from NYC to San Francisco, revolutionized travel and birthed car culture before being overshadowed by Route 66.
Explore the dark history of Ohio State Reformatory, from progressive rehabilitation center to overcrowded, violent facility, and its transformation into the iconic filming location for The Shawshank Redemption.
Uncover the improbable story of Rockefeller Center, from failed opera house to iconic NYC landmark built during the Great Depression, reshaping urban America against all odds.
Uncover the forgotten history of Shooters Island, NYC's hidden shipyard that built warships and royal yachts, from Revolutionary War spy base to abandoned ruins off Staten Island.
Uncover Chicago's evolution from church bell fire alerts to advanced 19th-century telegraph systems, exploring how network failures contributed to the Great Chicago Fire disaster.
Uncover the forgotten story of New York's double-decker elevated railways - engineering marvels with stacked stations and sky-high platforms that ruled the city before vanishing by 1973.
Uncover how Detroit's 8 Mile transformed from a simple road into America's most infamous racial dividing line, featuring segregation walls, redlining, and Eminem's cultural impact.
Uncover the fascinating story of California's isolated concrete arch in the San Gabriel Mountains, built during the Great Depression but abandoned after catastrophic 1938 floods destroyed its road.
Uncover the secrets of Track 61, NYC's hidden rail platform beneath the Waldorf Astoria, exploring its transformation from coal transport to presidential passage and urban legend.
Explore the eerie world of abandoned McDonald's locations, from UFO-shaped restaurants to floating "McBarges," uncovering the strange history behind forgotten golden arches.
Uncover how Toronto transformed its natural waterways into 3,400+ miles of underground tunnels, revealing the engineering and politics that buried the city's rivers forever.
Get personalized course recommendations, track subjects and courses with reminders, and more.