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

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

                                  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