Task Difficulty: 1.5 Out of 5.0
Terrain Difficulty: 1.5 Out of 5.0
Statystyka skrzynki
Thermo-Con House - OU007E

 ...At Fort Belvoir

Hidden by  DudleyGrunt

N 38° 41.187' W 77° 08.365' (WGS84)

 Coordinates in Other Systems
 Location: United States > Virginia
 Cache Type: Virtual
 Size: No container
 Status: Ready for Search
 Date Hidden: 01 September 2010
 Date Created: 30 August 2010
 Last Modified: 05 September 2014
 Waypoint: OU007E


{{found}} 7 x Found
{{not_found}} 0 x Did Not Find
{{comment}} 0 Comments
0 Notes
0 Watchers
6030 Visitors
5 x Rated
Rated as: Good
GeoKrety History

Available Maps: Opencaching,Google Maps

Cache Attributes

Quick Cache Kid Friendly Wheelchair Access Bring Your Own Pen Historic Site Listed on OCNA Only 

Please see the attributes article for more information.

Description   EN   

In 1948, the Department of Defense worked with Higgins Industries to develop a standard house design to meet the Army’s housing shortage. Higgins Industries designed and mass-produced landing craft during World War II and held the patent for ‘Thermo-Con,’ a cement material that expanded as it cured. The renowned industrial architects, Albert Kahn & Associates, designed the prototype in the International style and the 410th Engineer Battalion (Construction) completed the building in 1949. Due to its innovative design and construction techniques, the house was placed on the Virginia Landmarks Register in 1997. In 2000, the Army renovated and returned ‘Thermo-Con’ House to use as distinguished visitor housing.

 LOG PASSWORD: On a telephone pole out front of the house, you'll find a silver sign with 10 squares and 9 characters (ignore the one with the the full word).  The password will be the 9 characters together with no spaces and in CAPS.  The format is LNNNNLNNN (L=a letter, N=a number).  It will make sense when you're there.

Photos are appreciated, but not required.  You'll get "bonus points" if you do post one, though.

In order to log a find, you need to have visited the spot indicated.

You will also have an opporunity to log a Waymark associated with this site - WM4CZ2.


The Thermo-Con House is located on Fort Belvoir, a controlled access US Army installation. It is possible, however, to enter through the Tully Gate by simply showing a drivers license.

Visitors who wish to enter Fort Belvoir and do not have a Department of Defense ID  must use Tulley Gate. Simply drive to the checkpoint, as directed, and show a valid state driver's license. The Visitor Processing Operations Center (VPOC) is located at Tulley Gate (just north of Route One and VA 7100). For current information, call the VPOC at (703) 806-4892 or visit their web page.

CAUTION: While on post, be sure to strictly abide by the speed limits.  You can not rely on the same sort of buffer you might otherwise enjoy. Also note that you must use a hands free device for your cell phone while driving on post.

If you'd like to plan to meet up, drop me a note and I'll see if we can work it out.

For more information see this site on the history of Fort Belvoir housing.

Northern Virginia Geocaching OrganizationMilitary Association of GeoCachers


GeoCachers 4 Christ

Additional Waypoints

 Symbol   Type   Coordinates  Description
Parking AreaN 38° 41.167'
W 77° 08.328'
 Since it is used as visitor housing, you should not park at the house. 
Interesting PlaceN 38° 42.000'
W 77° 09.350'
 Tulley Gate, where you need to enter, if you do not have a DOD decal on your vehicle. 

Additional Hints   Decrypt

gurl ner mrebf





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Log Entries    {{found}} 7x {{not_found}} 0x {{comment}} 0x     Show All Log Entries   New Log Entry

1 23 September 2016 APolchek Found it

1 28 September 2014 LGFTGeos Found it

This was our first GeoCache find!  We had fun reading about the history of the house.  We've driven past the house numerous times and never took notice until today.  Thanks!

1 10 August 2014 Johmer and Tinks Found it

This is a cool piece of history.  Like other finders, I'm impressed with how modern the building looks, even though it was built ~65 years ago.  It looks like it's being lived in, so I wonder who gets the most unique house on post?

Thanks for bringing me here.  I've driven by before, but never really gave it much thought.  Also, thanks for the assistance with the PW. 

Pictures Connected with this Log Entry:

1 23 May 2012 ucobear Found it

Interesting design.  Thank you for bringing this up for my pleasure with this educational moment. 
Pictures Connected with this Log Entry:
History Display
History Display

1 11 November 2010 sfcchaz Found it

Spent this Veteran's Day caching. I found 10 geocaches, 5 terracaches and 2 opencaches. TNLN TFTC