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

In Appreciation of Sheila Dinneen Family and Neighbours

Submitted by @SignsTheReading.

Submitted by @SignsTheReading.

    Early Play-By-Play Radio Broadcast of a College Football Game

    Submitted by @TAMU.

    Submitted by @TAMU.

      After Milneford Mills

      Submitted by @heritagetoronto.

      Submitted by @heritagetoronto.

        Alex Haley

        Alex Haley (1921-1992) Alexander Murray Palmer Haley lived and maintained a writing studio here. Beginning in 1963 he conducted many in-depth interviews with Malcolm X for his first book, The...

        Alex Haley (1921-1992) Alexander Murray Palmer Haley lived and maintained a writing studio here. Beginning in 1963 he conducted many in-depth interviews with Malcolm X for his first book,...

          John Ericsson

          Submitted by pdxgrggles

          Submitted by pdxgrggles

            The Great Telescope

            145 years before ⁦the Hubble,⁩ this was the worlds foremost deep-sky observatory: the ‘Leviathan’ 72” telescope at ⁦ Birr Castle. It held the world record for 72 years.⁩ Submitted by @Shamrocketeer

            145 years before ⁦the Hubble,⁩ this was the worlds foremost deep-sky observatory: the ‘Leviathan’ 72” telescope at ⁦ Birr Castle. It held the world record for 72 years.⁩ Submitted by @Shamrocketeer

              R. C. Harris

              R. C. Harris (1875-1945) who masterminded much of the city's vital infrastructure, lived at Old City Hall from 1900 to 1909, and worked there from 1900 to 1945. Submitted by @heritagetoronto.

              R. C. Harris (1875-1945) who masterminded much of the city's vital infrastructure, lived at Old City Hall from 1900 to 1909, and worked there from 1900 to 1945. Submitted by @heritagetoronto.

                The Cliff Walk

                Submitted by @bthubbard.

                Submitted by @bthubbard.

                  Yorkville Town Hall

                  Submitted by @heritagetoronto.

                  Submitted by @heritagetoronto.

                    Old Burying Ground, Halifax

                    Submitted by @bthubbard.

                    Submitted by @bthubbard.

                      TO COMMEMORATE THE HEROISM AND SACRIFICE OF ALL COLORED SOLDIERS

                      TO COMMEMORATE THE HEROISM AND SACRIFICE OF ALL COLORED SOLDIERS WHO SERVED IN THE VARIOUS WARS ENGAGED IN BY THE UNITED STATES OF AMERICA THAT A LASTING RECORD SHALL BE MADE OF THEIR UNSELFISH...

                      TO COMMEMORATE THE HEROISM AND SACRIFICE OF ALL COLORED SOLDIERS WHO SERVED IN THE VARIOUS WARS ENGAGED IN BY THE UNITED STATES OF AMERICA THAT A LASTING RECORD SHALL BE MADE OF THEIR...

                        The Manufacture of Illuminating Gas

                        AAC TO COMMEMORATE THE INAUGURATION OF A CHEMICAL INDUSTRY IN AMERICA THE MANUFACTURE OF ILLUMINATING GAS THE FIRST FRANCHISE IN AMERICA TO PRODUCE AND DISTRIBUTE GAS FOR PUBLIC USE WAS GRANTED IN...

                        AAC TO COMMEMORATE THE INAUGURATION OF A CHEMICAL INDUSTRY IN AMERICA THE MANUFACTURE OF ILLUMINATING GAS THE FIRST FRANCHISE IN AMERICA TO PRODUCE AND DISTRIBUTE GAS FOR PUBLIC USE WAS GRANTED IN...

                          Clarence "Hank" Raimondi and John A. Raimondi

                          IN MEMORY OF CLARENCE RAIMONDI "HANK" JOHN A. RAIMONDI WHEN YOU SEE A RAINBOW YOU'LL KNOW WHO'S MIXING THE COLORS. Submitted by @DIYGene.

                          IN MEMORY OF CLARENCE RAIMONDI "HANK" JOHN A. RAIMONDI WHEN YOU SEE A RAINBOW YOU'LL KNOW WHO'S MIXING THE COLORS. Submitted by @DIYGene.

                            South Humber Park Pavilion

                            Submitted by @heritagetoronto.

                            Submitted by @heritagetoronto.

                              John Batman

                              Submitted by @HelenZaltzman

                              Submitted by @HelenZaltzman

                                Jenny Geddes

                                In 1637, Edinburgh street-seller Jenny Geddes threw her stool at the Dean of\xc2\xa0St Giles' Cathedral in protest at the use of a new prayer book, sparking a riot which led to the Wars of the...

                                In 1637, Edinburgh street-seller Jenny Geddes threw her stool at the Dean of\xc2\xa0St Giles' Cathedral in protest at the use of a new prayer book, sparking a riot which led to the Wars of...

                                  This Bomb

                                  Submitted by Elliott R. Plack, CC0, via Wikimedia Commons

                                  Submitted by Elliott R. Plack, CC0, via Wikimedia Commons

                                    Site of the United States Olympic Track and Field Trials

                                    CALIFORNIA STATE UNIVERSITY SACRAMENTO Site of the United States Olympic Track and Field Trials July 14 - 23, 2000

                                    CALIFORNIA STATE UNIVERSITY SACRAMENTO Site of the United States Olympic Track and Field Trials July 14 - 23, 2000

                                      1995 Russell Hill Subway Accident

                                      Toronto Transit Commission DEDICATED TO OUR PASSENGER KINGA SZABO HUI XIAN LIN CHRISTINA MUNAR REYES WHO LOST THEIR LIVES FRIDAY AUGUST 11, 1995 AT THIS LOCATION IN TORONTO'S WORST SUBWAY ACCIDENT...

                                      Toronto Transit Commission DEDICATED TO OUR PASSENGER KINGA SZABO HUI XIAN LIN CHRISTINA MUNAR REYES WHO LOST THEIR LIVES FRIDAY AUGUST 11, 1995 AT THIS LOCATION IN TORONTO'S WORST SUBWAY ACCIDENT...

                                        River Bench

                                        Submitted by quincetessence

                                        Submitted by quincetessence