http://static5.depositphotos.com/1001977/453/i/950/depositphotos_4534237-Old-metal-door-in-old-town.jpg

I could imagine a whole texture set and architectural style being extrapolated from just this door. 

picture from post 2111 reminded me of the old San Francisco Embarcadero Freeway project that was stopped midway from completion. There was a decade of freeway's to nowhere while it was fought out in the courts. They eventually were demolished and are why you have to use city streets to get to the Golden Gate Bridge.

The freeway was a blight to the waterfront though so I get why it was stopped. The Nimitz collapse alone is a good reason as to why that design is a bad idea and there's only one remaining freeway like it (280 from the 101 split for about a mile) that I know of and every time I drive it I'm always hopeful that no major earthquake happens right then.

Yeah, yeah. I'm a San Francisco native (and old), so sue me. 

http://weburbanist.com/2013/04/15/7-secret-architectural-wonders-of-the-world/2/ 

This is hella goood.

http://31.media.tumblr.com/f673866bb3cd2428275905d6372a22da/tumblr_mtpajkDCaj1qhttpto3_1280.jpg 

Someone just managed to take a picture of my next map..:) 

http://www.blenderguru.com/wp-content/uploads/2009/05/viktor-fretyan2.jpg
http://blenderguru.com/wp-content/uploads/2009/04/redvertex2.jpg
http://www.blenderguru.com/wp-content/uploads/2009/05/naoshima.jpg

via 

http://ljtopper.livejournal.com/537468.html 

Dom �ber Einer Stadt (Cathedral Towering over a Town) and Medieval Town by Water by Karl Friedrich Schinkel, around 1830, originals were destroyed by fire.

http://www.pinakothek.de/karl-friedrich-schinkel/dom-ueber-einer-stadt 

you'll like this
http://vimeo.com/7809605 

http://quiteizzy.deviantart.com/art/Bebok-384567266 

 

http://fc06.deviantart.net/fs71/f/2013/082/7/b/prawn_soldier_textured_by_stillenacht-d5yy55j.jpg 

Fooking prawns 

Prawns 4 life 

http://explodingactresses.tumblr.com/ 

http://www.goodtextures.com/ looks like a very nice source for free textures. 

Complete with an underground palace and churches.

http://whc.unesco.org/pg.cfm?cid=31&l=en&id_site=32&gallery=1&&index=13

Tenth one of twentyfour is my favourite. I was close to make an speedmap similar to that on Sm173 

Licking the walls was disallowed though... 

do it anyway 

For once I can say "I've been there" too. Funnily enough all I could think about whilst I was in there was "This is really Quakey". 

How about this?

http://www.flickriver.com/photos/tags/castelo+andrade/interesting/
http://www.flickriver.com/photos/tags/monasteriodecarboeiro/interesting/
http://www.flickriver.com/photos/tags/mosteiro+monfero/interesting/

This one is man-made, by Romans, to extract gold.
http://www.flickriver.com/photos/tags/montefurado/interesting/

This is some sort of big educational park two rich brothers made 120 years ago for every one, filled with caves and strange things. Use the second link for more photos.
http://www.flickriver.com/photos/tags/parque+pasatempo/interesting/
https://www.google.es/search?q=parque+do+pasatempo&client=firefox-a&rls=org.mozilla:es-ES:official&source=lnms&tbm=isch&sa=X&ei=TAZ5UuPkC6m70QXT-ICQDQ&ved=0CAkQ_AUoAQ&biw=1920&bih=951

Those are the only ones i could think right now that aren't famous enough, but can be interesting in photos. Sorry, but they are in Galician, not in English. 

Love those caves. 

He's done concept work for Guildwars...
http://theoprins.blogspot.be/ 

http://www.boredpanda.com/abandoned-places/ 

http://translate.google.es/translate?hl=en&sl=es&u=http://lugares-con-historia.blogspot.com/&prev=/search%3Fq%3Dlugares%2Bcon%2Bhistoria%2Bblog%26client%3Dfirefox-a%26hs%3DauE%26rls%3Dorg.mozilla:es-ES:official%26biw%3D1920%26bih%3D978

FifthElephant, those look very good. �Who does the 7th or the 16th in Quake?