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

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

                                FDR Visits Port Angeles

                                Submitted by @Ritterton

                                Submitted by @Ritterton

                                • port angeles

                                First Known Human Presence 696 BCE

                                Submitted by @Ritterton

                                Submitted by @Ritterton

                                • port angeles

                                Port Angeles Incorported

                                Submitted by @Ritterton

                                Submitted by @Ritterton

                                • port angeles

                                First European Explorers

                                Submitted by @Ritterton

                                Submitted by @Ritterton

                                • port angeles

                                Second National City

                                Submitted by @Ritterton

                                Submitted by @Ritterton

                                • port angeles
                                • lincoln
                                • second national city