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  2. Lockkeeper's House (Washington, D.C.) - Wikipedia

    en.wikipedia.org/wiki/Lockkeeper's_House...

    The Lockkeeper's House is the oldest building on the National Mall in Washington, D.C. [2] It was built in 1837 [2] at what is now the southwest corner of 17th Street, NW and Constitution Avenue, NW, near Constitution Gardens . The building dates to a period when the south end of 17th Street, NW was a wharf and Constitution Avenue, NW was the ...

  3. Keystone (architecture) - Wikipedia

    en.wikipedia.org/wiki/Keystone_(architecture)

    A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to bear weight. [ 1][ 2][ 3] In arches and vaults (such as quasi-domes) keystones ...

  4. Pont des Arts - Wikipedia

    en.wikipedia.org/wiki/Pont_des_Arts

    Pont des Arts. /  48.85833°N 2.33750°E  / 48.85833; 2.33750. The Pont des Arts or Passerelle des Arts is a pedestrian bridge in Paris which crosses the River Seine. It links the Institut de France and the central square ( cour carrée) of the Palais du Louvre, (which had been termed the "Palais des Arts" under the First French Empire ).

  5. Locksmith's House - Wikipedia

    en.wikipedia.org/wiki/Locksmith's_House

    Willenhall, England. Coordinates. 52°35′00″N 2°03′33″W  / . 52.583325°N 2.059047°W. / 52.583325; -2.059047. Website. www .bclm .co .uk /lhhome .htm. The Locksmith's House (formerly Willenhall Lock Museum) is a museum in Willenhall, England. The premises, on New Road, consist of a house and backyard workshops, typical of the ...

  6. My Unique Home: This house was built by robots in 7 days - AOL

    www.aol.com/lifestyle/unique-home-house-built...

    Check back next week for another wild story, from a mermaid-inspired bungalow, an old airplane transformed into the ultimate bachelor pad and an entire house dedicated to cats. This Washington, D ...

  7. Master keying - Wikipedia

    en.wikipedia.org/wiki/Master_keying

    A maison key system is a keying system that permits a lock to be opened with a number of unique, individual keys. Maison key systems are often found in apartment building common areas, such as main entrance or a laundry room where individual residents can use their own apartment key to access these areas.

  8. Yale-Cady Octagon House and Yale Lock Factory Site

    en.wikipedia.org/wiki/Yale-Cady_Octagon_House...

    September 29, 2007 [ 1] The Yale-Cady Octagon House and Yale Lock Factory Site is a private residence at 7550 North Main Street in Newport, New York, comprising an historic octagonal house and the adjoining site of the lock factory of Linus Yale, Sr. and his son Linus Yale, Jr., the inventor of the cylinder lock and the founders of the Yale ...

  9. Lock and Dam No. 19 - Wikipedia

    en.wikipedia.org/wiki/Lock_and_Dam_No._19

    Aerial view of the locks at Lock and Dam 19. The 1957 lock is the largest at left, with the dewatered drydock and 1913 lock at its right. The old Keokuk Rail Bridge and Keokuk-Hamilton Bridge are visible in the foreground. View is upriver to the northeast. The main lock was constructed from 1952 to 1957 and is 1,200 feet (366 m) long and 110 ...