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

Gulf Intracoastal Waterway - Hwy. 1 Intracoastal Boat Launch

The Port Allen Lock connects the Gulf Intracoastal Waterway and the Gulf of Mexico to the Port of Greater Baton Rouge and other points north along the Mississippi River, shortening the distance for ...

The Port Allen Lock connects the Gulf Intracoastal Waterway and the Gulf of Mexico to the Port of Greater Baton Rouge and other points north along the Mississippi River, shortening the distance ...

  • louisiana
  • waterway
  • environment

Lockport

 Ruins of locks not washed away by a crevasse in 1917 are near here for which Lockport is named. An earlier settlement was named Longueville by 1835 when William Fields donated land for a canal later ...

 Ruins of locks not washed away by a crevasse in 1917 are near here for which Lockport is named. An earlier settlement was named Longueville by 1835 when William Fields donated land for a canal ...

  • louisiana
  • community

Detour Reef Light Station

Located where the St. Mary’s River enters Lake Huron from Lake Superior, DeTour Passage separates the Upper Peninsula from Drummond Island. It has long been a choke point for Great Lakes shipping. ...

Located where the St. Mary’s River enters Lake Huron from Lake Superior, DeTour Passage separates the Upper Peninsula from Drummond Island. It has long been a choke point for Great Lakes ...

  • michigan
  • michigan histor...

Hardware

Eberbach Hardware, Northeast Corner, Main and Washington, Ca. 1893   In 1872 William Herz built 112 West Washington Street on the alley to your left for his popular painting and decorating business   ...

Eberbach Hardware, Northeast Corner, Main and Washington, Ca. 1893   In 1872 William Herz built 112 West Washington Street on the alley to your left for his popular painting and decorating business   ...

    Chittenden Locks and Lake Washington Ship Canal

    • seattle
    • ballard
    • washington
    • locks
    • gardens

    The Carl S. English, Jr. Gardens

    • seattle
    • ballard
    • washington
    • locks
    • gardens

    Savannah—Ogeec hee Canal

    Chartered in 1842, the Savannah-Ogeechee Canal was constructed between 1826 and 1830 by African and Irish laborers who moved thousands of cubic yards of earth. A boon to Georgia´s economy, the canal ...

    Chartered in 1842, the Savannah-Ogeechee Canal was constructed between 1826 and 1830 by African and Irish laborers who moved thousands of cubic yards of earth. A boon to Georgia´s economy, the ...

    • lat34

    Teddington Locks Plaque

    Plaque at the lockkeeper's office at Teddington Lock, at the head of the tidal Thames. © Copyright Colin Smith and licensed for reuse under this Creative Commons Licence . Submitted via Geograph

    Plaque at the lockkeeper's office at Teddington Lock, at the head of the tidal Thames. © Copyright Colin Smith and licensed for reuse under this Creative Commons Licence . Submitted via Geograph

    • teddington lock
    • historic sites ...
    • geograph

    Aqueduct stonework sign near Hardings Wood, Staffordshire

    POOL LOCK AQUEDUCT MDCCCXXVIIII This is on the side of the aqueduct (built in 1829) carrying the Macclesfield Canal across the Trent and Mersey Canal a few metres north-west of the paired locks (No ...

    POOL LOCK AQUEDUCT MDCCCXXVIIII This is on the side of the aqueduct (built in 1829) carrying the Macclesfield Canal across the Trent and Mersey Canal a few metres north-west of the paired locks (No ...

    • aqueduct
    • canals
    • geograph

    SMILEY'S FALLS

    Ruins remain of locks and dams built by the Cape Fear & Deep River Navigation Company in 1850s. Rapids extend upstream 1- 1/2 miles.Plaque via North Carolina Highway Historical Marker Program, and is ...

    Ruins remain of locks and dams built by the Cape Fear & Deep River Navigation Company in 1850s. Rapids extend upstream 1- 1/2 miles.Plaque via North Carolina Highway Historical Marker Program, and is ...

    • ncmarkers
    • north carolina

    ROANOKE CANAL

    Canal and locks around river rapids completed 1834 by Roanoke Navigation Company. Highway crosses route of canal at this point.Plaque via North Carolina Highway Historical Marker Program, and is used ...

    Canal and locks around river rapids completed 1834 by Roanoke Navigation Company. Highway crosses route of canal at this point.Plaque via North Carolina Highway Historical Marker Program, and is used ...

    • ncmarkers
    • north carolina

    ROANOKE CANAL

    Canal and locks completed around river rapids, 1834. Highway crosses canal route here. A lock is 200 feet south.Plaque via North Carolina Highway Historical Marker Program, and is used with their ...

    Canal and locks completed around river rapids, 1834. Highway crosses canal route here. A lock is 200 feet south.Plaque via North Carolina Highway Historical Marker Program, and is used with ...

    • ncmarkers
    • north carolina

    BATTLE OF SOUTH MILLS

    Confederates, on Apr. 19, 1862, repelled Union army here, prevented demolition of Dismal Swamp Canal locks three miles N.W.Plaque via North Carolina Highway Historical Marker Program, and is used ...

    Confederates, on Apr. 19, 1862, repelled Union army here, prevented demolition of Dismal Swamp Canal locks three miles N.W.Plaque via North Carolina Highway Historical Marker Program, and is used ...

    • ncmarkers
    • north carolina

    The TVA System of Multi-Purpose Dams, Fontana Dam

    35.449995,-83.805303 Fontana Dam Fontana dam, a multi-purpose dam on the little Tennessee reiver, is 480 feet, TVA’s highest. Begun soon after Pearl Harbor, it was completed in less than three years. ...

    35.449995,-83.805303 Fontana Dam Fontana dam, a multi-purpose dam on the little Tennessee reiver, is 480 feet, TVA’s highest. Begun soon after Pearl Harbor, it was completed in less than three ...

    • dam
    • fontana dam
    • tva

    Lieutenant-Colonel John By, R.E.

    Born in London, England, about 1779, By graduated from the Royal Military Academy, Woolwich, in 1799. He was attached to the Royal Engineers in Canada (1802-1811) and later served in the Peninsular ...

    Born in London, England, about 1779, By graduated from the Royal Military Academy, Woolwich, in 1799. He was attached to the Royal Engineers in Canada (1802-1811) and later served in the Peninsular ...

    • toronto
    • ontario
    • alan brown

    Magnetawan Lock

    The lock at Magnetawan, built by the Ontario Government, 1883-6, was replaced in 1911 by the present concrete structure. The original stone-filled timber cribwork measured 34 by 8.5 metres. The lock ...

    The lock at Magnetawan, built by the Ontario Government, 1883-6, was replaced in 1911 by the present concrete structure. The original stone- filled timber cribwork measured 34 by 8.5 metres. The lock ...

    • toronto
    • ontario
    • alan brown

    The Old Welland Canal

    Originally conceived in 1818 by its promoter, William Hamilton Merritt, to divert trade from the Erie Canal and New York and built under private auspices, the canal was opened to traffic in 1829. ...

    Originally conceived in 1818 by its promoter, William Hamilton Merritt, to divert trade from the Erie Canal and New York and built under private auspices, the canal was opened to traffic in ...

    • toronto
    • ontario
    • alan brown

    The Royal Sappers and Miners

    In 1827 the Royal Sappers and Miners, the special construction corps of the British Army, raised the 7th and 15th Companies to serve in the building of the Rideau Canal. Comprising 160 skilled ...

    In 1827 the Royal Sappers and Miners, the special construction corps of the British Army, raised the 7th and 15th Companies to serve in the building of the Rideau Canal. Comprising 160 skilled ...

    • toronto
    • ontario
    • alan brown

    Rideau Canal 1826-1832

    Financed by the British government, on the Duke of Wellington's advice, it was built to provide a secure military route between Upper and Lower Canada. Work was supervised by military engineers ...

    Financed by the British government, on the Duke of Wellington's advice, it was built to provide a secure military route between Upper and Lower Canada. Work was supervised by military ...

    • toronto
    • ontario
    • alan brown

    The Williamsburg Canals

    The canals at Farran's Point, Rapide Plat and Galops were known collectively as the Williamsburg Canals. All three were built in the period 1844-56 on the north side of the St. Lawrence to form part ...

    The canals at Farran's Point, Rapide Plat and Galops were known collectively as the Williamsburg Canals. All three were built in the period 1844-56 on the north side of the St. Lawrence to form ...

    • toronto
    • ontario
    • alan brown