URL links are fine. It's using the IMG tags and having the picture show on our site that makes for a problem.
Glad to have that clarified. Sorry about the mistake, CC. Now I know the difference.
Not a problem. Thanks
Mutai Sho-Rin and
T'Bonz for clarifying, and so promptly.
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As has been observed in elsewhere on the board, URLs to TrekCore images sometimes show up as FORBIDDEN, even if they have been tested before and found to work. If this happens, you can simply copy and paste the link into the address field of a fresh browser window, and it should open in there.
There are actually quite a lot of door handles in TOS. As has been mentioned by
GSchnitzer, most of them appear in "old buildings" as it were, or perhaps more specifically and inclusively, buildings for whatever real-world or in-universe reason are built according to contemporary or old Earth architecture. I've added three more episodes to my part of the list, now bringing it to 13 episodes:
Miri -
http://tos.trekcore.com/hd/albums/1x08hd/mirihd315.jpg
The Menagerie, Part II -
http://tos.trekcore.com/gallery/albums/1x12/themanagerie2_115.jpg
The Squire of Gothos -
http://tos.trekcore.com/hd/albums/1x17hd/thesquireofgothoshd105.jpg
Tomorrow Is Yesterday -
http://tos.trekcore.com/gallery/albums/1x19/Tomorrow_is_Yesterday_167.JPG
The Return of the Archons -
http://tos.trekcore.com/gallery/albums/1x21/thereturnofarchons_028.jpg
The City on the Edge of Forever -
http://tos.trekcore.com/gallery/albums/1x28/cityontheedge_655.jpg
Catspaw -
http://tos.trekcore.com/gallery/albums/2x07/2x07_Catspaw174.jpg
A Piece of the Action -
http://tos.trekcore.com/gallery/albums/2x17/pieceoftheaction_081.jpg
Patterns of Force -
http://tos.trekcore.com/gallery/albums/2x21/PatternsOfForce0346.jpg
Assignment: Earth -
http://tos.trekcore.com/hd/albums/2x26hd/assignmentearthhd0671.jpg
Spectre of the Gun -
http://tos.trekcore.com/hd/albums/3x06hd/spectreofthegunhd0627.jpg
Requiem for Methuselah -
http://tos.trekcore.com/gallery/albums/3x19/requiemformethuselah_213.jpg
All Our Yesterdays -
http://tos.trekcore.com/hd/albums/3x23hd/allouryesterdayshd0293.jpg
The door handles in
All Our Yesterdays also count as (presumably) strictly alien and not facsimiles of Earth structures (at least not in-universe

), with those in
Miri,
The Menagerie, Part II, and
The Return of the Archons (assuming the one on Rigel VII was accurate, alien, and not just made up for the illusion; and unless Miri's planet was really a total copy of Earth).
The above examples are not intended to be exhaustive, even within each episode, and at this point I'm posting it mainly just to supplement the examples that
GSchnitzer gave just above, to move ever towards nerdy completeness. In that vein, the example in
Requiem for Methuselah, a door handle in a 23rd Century human dwelling, is interesting enough that I've made a scaled down version of it available as an inline image for your convenience.
There are a lot of door handles in TOS! With
GSchnitzer's four episodes and my 13, that brings the total to at least 17 episodes in which door handles occur. Although I'm not sure, it wouldn't surprise me if there were at least one or two more.