Geodetic Survey Markers are permanently affixed objects at various locations all over to enable land surveying, civil engineering and mapping to be done efficiently. These objects are usually metal disks, but can be any other object that serves as a control point.
www.geocaching.com has a gallery of the USA ones, but not the Canadian, so I figured I'd create a gallery of them as I find them...

CANADA

PeggysCove1.jpg (320697 bytes)
Peggy's Cove, Nova Scotia, Canada

PeggysCove2.jpg (360519 bytes)
Peggy's Cove, Nova Scotia, Canada

PeggysCove3.jpg (395595 bytes)
Peggy's Cove, Nova Scotia, Canada
N44° 29.513
W063° 55.063

Toronto_EatonsCenter.jpg (291987 bytes)
Toronto, Ontario, Canada
In the outdoor market across from 
the Eaton's Centre

88u505_Marker.jpg (855799 bytes) 88u505_sign.jpg (686884 bytes)
Ottawa, Ontario, Canada
N45 19.177
W075 51.310

Image17.jpg (278482 bytes)
Ottawa, Ontario, Canada
Mitel Parking Lot 		Image17b.jpg (313252 bytes)
Ottawa, Ontario, Canada
Kanata Wendy's Parking Lot 		 

USA

1.jpg (214163 bytes)
001X
Las Vegas, Nevada, USA
N 36° 06.105
W 115° 10.363
This one is on the sidewalk in front of the MGM Grand, on the East side of Las Vegas Blvd; near the walk of stars.

13.jpg (348867 bytes)
 013X
Las Vegas, Nevada, USA
N 36° 06.234
W 115° 10.363
This BM is in the side street just East of Las Vegas Blvd very near the Coca Cola store.
This one is very close to number 012 as well. (012X is about 8' south directly in front of the store) 		23.jpg (215490 bytes)
 023X
Las Vegas, Nevada, USA
N 36° 06.290
W 115° 10.363 		24.jpg (203357 bytes)
024X
Las Vegas, Nevada, USA
N 36° 06.292
W 115° 10.363
25.jpg (200200 bytes)
 025X
Las Vegas, Nevada, USA
N 36° 06.306
W 115° 10.361
This marker is on the East side of Las Vegas Blvd, on the sidewalk in front of the Walgreen's Drug Store. 		26.jpg (203718 bytes)
 026X
Las Vegas, Nevada, USA 		5571.jpg (189769 bytes)
 PLS 5571
Las Vegas, Nevada, USA 		34.jpg (234276 bytes)
034X
Las Vegas, Nevada, USA
35.jpg (222465 bytes)
 035X
Las Vegas, Nevada, USA 		36.jpg (178965 bytes)
 036X
Las Vegas, Nevada, USA 		54.jpg (226909 bytes)
 054X
Las Vegas, Nevada, USA 		55.jpg (232315 bytes)
055X
Las Vegas, Nevada, USA
111Y.jpg (225460 bytes)
 111Y
Las Vegas, Nevada, USA 		mess.jpg (175340 bytes)
Las Vegas, Nevada, USA
This marker is on the East side of Las Vegas Blvd, on the curb in front if Margaritaville
 		PLS7008.jpg (237417 bytes)
 PLS 7008
Las Vegas, Nevada, USA