A gigantic map of all the cool plaques in the world. A project of 99% Invisible.

Jackson Mine

On this spot on September 19, 1844, William A. Burt, a deputy government surveyor, was the first to discover the great Lake Superior iron ore deposits. Peculiar fluctuations in his magnetic...

On this spot on September 19, 1844, William A. Burt, a deputy government surveyor, was the first to discover the great Lake Superior iron ore deposits. Peculiar fluctuations in his...

  • michigan
  • michigan his...

Andrew Carnegie Mansion

    Willow Run (1941-1953) / Willow Run (1953-present)

    After entering World War II in 1941, America desperately needed military equipment and supplies. The Ford Motor Company had begun building this factory in April 1941. Outstanding industrial...

    After entering World War II in 1941, America desperately needed military equipment and supplies. The Ford Motor Company had begun building this factory in April 1941. Outstanding industrial...

    • michigan
    • michigan his...

    Croton Hydroelectric Plant

    The Grand Rapids - Muskegon Power Company (a predecessor to today's Consumers Energy Company) built the Croton Hydroelectric Plant in 1906 - 1907. The plant and its 110,000-volt transmission line...

    The Grand Rapids - Muskegon Power Company (a predecessor to today's Consumers Energy Company) built the Croton Hydroelectric Plant in 1906 - 1907. The plant and its 110,000-volt transmission line...

    • michigan
    • michigan his...

    Spirit Catcher

    The donation of the SPIRIT CATCHER in 1986 inspired the establishment of a public art gallery in Barrie. The Barrie Gallery Project opened to the public in 1988 and in 1992 became the MacLaren Art...

    The donation of the SPIRIT CATCHER in 1986 inspired the establishment of a public art gallery in Barrie. The Barrie Gallery Project opened to the public in 1988 and in 1992 became the MacLaren Art...

      Bohemian Monterey

      1874 Bohemian Monterey World renowned artist Jules Tavernier established a studio in Monterey. A bohemian culture soon followed as Monterey became a favorite ocean-side retreat for artists and writers.

      1874 Bohemian Monterey World renowned artist Jules Tavernier established a studio in Monterey. A bohemian culture soon followed as Monterey became a favorite ocean-side retreat for artists and writers.

        First Bomb of World War One

        FIRST BOMB OF WORLD WAR ONE To be dropped on London by Zeppelin LZ38fell on this house 31 May 1915 Submitted by @DrFidelius

        FIRST BOMB OF WORLD WAR ONE To be dropped on London by Zeppelin LZ38fell on this house 31 May 1915 Submitted by @DrFidelius

          Ludington Hotel

          In 1864 E. Gaynor built the Gaynor House hotel, which he renamed the Ludington House in 1871 after lumberman Nelson Ludington. In the late 1880s proprietor John Christie enlarged the hotel and...

          In 1864 E. Gaynor built the Gaynor House hotel, which he renamed the Ludington House in 1871 after lumberman Nelson Ludington. In the late 1880s proprietor John Christie enlarged the hotel...

          • michigan
          • michigan his...

          Allegheny County Courthouse and Jail

          From the Flickr group Historical Markers, photo by sportsedit15224, full page.License is Attribution-NonCommercial-ShareAlike License

          From the Flickr group Historical Markers, photo by sportsedit15224, full page.License is Attribution- NonCommercial-ShareAlike License

            Crosby Hall

            Crude oil experiments at Crosby Hall (@dartmouth ) helped lead to the early petroleum industry. Submitted by @LostToHistory

            Crude oil experiments at Crosby Hall (@dartmouth ) helped lead to the early petroleum industry. Submitted by @LostToHistory

              Dr. Jose P. Rizal Community Center

              “He visited places of interest and left the city at 8:25 p.m.” https://t.co/u3wMZcBWyr TweetSubmitted by @robertloerzel

              “He visited places of interest and left the city at 8:25 p.m.” https://t.co/u3wMZcBWyr TweetSubmitted by @robertloerzel

                Kiesling House

                @readtheplaque Kiesling House. New Ulm, MN #readtheplaque https://t.co/eWI2aAdW23 TweetSubmitted by @robblerouser

                @readtheplaque Kiesling House. New Ulm, MN #readtheplaque https://t.co/eWI2aAdW23 TweetSubmitted by @robblerouser

                  New Ulm's Glockenspiel

                  Submitted by @robblerouser

                  Submitted by @robblerouser

                    Antioch City Hall

                    CITY HALL DEDICATED NOVEMBER 29 1980 TO THE CITIZENS OF ANTIOCH   CORNERSTONE CEREMONY NOV 29, 1980 GRAND LODGE FREE & ACCEPTED MASONS OF CALIFORNIA      

                    CITY HALL DEDICATED NOVEMBER 29 1980 TO THE CITIZENS OF ANTIOCH   CORNERSTONE CEREMONY NOV 29, 1980 GRAND LODGE FREE & ACCEPTED MASONS OF CALIFORNIA    

                      War Dog Memorial

                      • war dog
                      • egor

                      Eugene Field

                      IN DEDICATION TO EUGENE FIELD 1850-1895 THE CHILDREN'S POET "WYNKEN, BLYNKEN AND NOD" "THE DUEL" "LITTLE BOY BLUE" "WITH BIG TIN TRUMPET AND LITTLE RED DRUM MARCHING LIKE SOLDIERS. THE CHILDREN...

                      IN DEDICATION TO EUGENE FIELD 1850-1895 THE CHILDREN'S POET "WYNKEN, BLYNKEN AND NOD" "THE DUEL" "LITTLE BOY BLUE" "WITH BIG TIN TRUMPET AND LITTLE RED DRUM MARCHING LIKE SOLDIERS. THE CHILDREN...

                        Eureka Slope

                        • coal
                        • eureka

                        A

                        FROM 1860 TO 1906, THIS WAS THE LARGEST COAL MINING DISTRICT IN CALIFORNIA. FIVE TOWNS (NORTONVILLE, SOMERSVILLE, STEWARTSVILLE, JUDSONVILLE, AND WEST HARTLEY) GREW UP AROUND TWELVE MAJOR MINES....

                        FROM 1860 TO 1906, THIS WAS THE LARGEST COAL MINING DISTRICT IN CALIFORNIA. FIVE TOWNS (NORTONVILLE, SOMERSVILLE, STEWARTSVILLE, JUDSONVILLE, AND WEST HARTLEY) GREW UP AROUND TWELVE MAJOR MINES....

                        • ecv
                        • coal
                        • tailings
                        • railroad beds
                        • the towns are gone

                        "Compy Copmomizzo" Municipal Fishing Pier

                        U.E. "COMPY" COMPOMIZZO MUNICIPAL FISHING PIER "GET HOOKED ON FISHİNG.NOT DRUGS" DEDICATED THIS 4th DAY OF JULY, 2000    

                        U.E. "COMPY" COMPOMIZZO MUNICIPAL FISHING PIER "GET HOOKED ON FISHİNG.NOT DRUGS" DEDICATED THIS 4th DAY OF JULY, 2000  

                          Jerome Waldie Plaza

                          JEROME WALDIE PLAZA IN APPRECIATION TO A NATIVE SON OF ANTIOCH FOR MANY YEARS OF DEDICATED PUBLIC SERVICE IN THE STATE LEGISLATURE AND U.S. CONGRESSOCTOBER 1988

                          JEROME WALDIE PLAZA IN APPRECIATION TO A NATIVE SON OF ANTIOCH FOR MANY YEARS OF DEDICATED PUBLIC SERVICE IN THE STATE LEGISLATURE AND U.S. CONGRESSOCTOBER 1988