These are two general structure websites

Building Big

GreatBuildings.com

Eiffel Tower

http://www.tour-eiffel.fr/teiffel/uk/

http://www.teachingtools.com/Slinky/eiffel.html

Fallingwater

http://www.wpconline.org/fallingwaterhome.htm

http://www.inusa.com/tour/pa/laurel/fallingw.htm

http://www.fay-west.com/fayette/fallingwater/

Golden Gate Bridge

http://www.sfmuseum.org/hist9/mcgloin.html

http://www.teachingtools.com/Slinky/golden.html

Great Wall of China

http://www.chinavista.com/travel/greatwall/greatwall.html

http://www.travelchinaguide.com/china_great_wall/

http://ce.eng.usf.edu/pharos/wonders/Forgotten/greatwall.html

Himeji Castle

http://www.jgc.co.jp/waza/a5_himeji/castle01.htm

Houses of Parliament/Big Ben

http://www.aboutbritain.com/BigBen.htm

http://www.aboutbritain.com/HousesParliament.htm

http://www.whitechapelbellfoundry.co.uk/bigben.htm

http://www.loc.gov/jefftour/history.html

http://www.bluffton.edu/~sullivanm/washdc/libcongress/jefferson.html

Memorial Stadium

Monticello

Pentagon

http://www.greatbuildings.com/buildings/The_Pentagon.html

http://pentagon.afis.osd.mil/

Great Pyramid of Khufu

http://www.guardians.net/egypt/gp1.htm

http://www.pbs.org/wgbh/nova/pyramid/explore/khufudescnon.html

Roman Colosseum

http://www.teachingtools.com/Slinky/colosseum.html

Statue of Liberty

http://www.nps.gov/stli/historyculture/index.htm

http://www.endex.com/gf/buildings/liberty/libertyfacts.htm

Sydney Opera House

http://www.cultureandrecreation.gov.au/articles/sydneyoperahouse/

Taj Mahal

http://ce.eng.usf.edu/pharos/wonders/Forgotten/tajmahal.html

http://www.islamicity.com/Culture/Taj/default.htm

Washington Monument

http://www.nps.gov/wamo/home.htm

http://www.cr.nps.gov/nr/travel/wash/dc72.htm

White House

http://www.whitehouse.gov/history/facts.html

http://www.whitehousehistory.org/04/subs/04_a02.html

World Trade Center

http://www.skyscraper.org/tallest/t_wtc.htm

http://www.pbs.org/wgbh/buildingbig/wonder/structure/world_trade.html