TRI-CORNER: MD/WV/VA
A fine-tune revisit
We did this tri-point a few years back, accepting the "Welcome to Virginia" sign on US340 as the 3-state juncture as "close enough." But the sign is about 300ft off and, since then, we wanted a more intimate pic with the truer 3Pt.
Referring to Jack P.'s guide (blog right column), there's a USGS marker at the base of the rugged cliff on 340's south shoulder west of the VA sign. It's about 2ft. off the ground and set in a 1ft-square shelf in the rock - not the true 3-state intersection, but a vertical reference marker.
Our NGS Data Sheet describes it's exact distance from the road center, the WV 340 bridge, that VA welcome sign, and Chestnut Hill Rd., but zip reference to the WV/VA line or the 3Pt. However, about 25ft east of the BM, there's a rusted steel post on the shoulder and on the opposite, or north side of the road, there's a formidable, 3-sided concrete post on the outside of the guard rail. It's shape was assuringly appropriate.
We had no information on this marker, but it appears to have been there a while and, we supposed, marking the WV/VA state line.
In addition, a white, dashed line was hand-painted across the highway, connecting these posts with the word "END" on the WV, or west, side. Hmm...we thought, this had to be the WV/VA state line.
10ft north of the triangular post, we spyed a concrete stub with a brass "NPS" plate, designating the edge of Harpers Ferry National Park in WV. Sighting northward along the white 340 line to the Potomac, then, placed the true tripoint somewhere close to a big flat rock on the river's edge.
But the river changes and the "low water mark" defines the MD line, whenever/wherever that is. It's a 3Pt of the 3rd kind - nebulous - so don't count on locating the precise junction for an album shot as myself pictured above on that rock that I estimated to be much closer to accurate than the 340 VA welcome sign.
Note: There are several steep, rooty, rocky, muddy, trash-littered paths downhill to the Potomac, and a tangle of tree debris and slippery rocks on the lower bank. Use care here and on 340 which is highly trafficked and fast.
Pic set:
http://www.flickr.com/photos/11330680@N06/2152717136/in/set-72157603590802020/
Map:
Click here: TopoZone - White Horse Rapids, USGS Harpers Ferry (VA,WV,MD) Topo Map
NGS Data Sheet:
http://www.geocaching.com/mark/datasheet.aspx?PID=JV3887
Groundspeak Benchmarks:
http://www.geocaching.com/mark/

TRI-CORNER: PA/WV/MD
An end-of-year revisit

This tri-point is near Markleysburg, PA, so it's just a matter of getting there, best way, and look for the NO OUTLET at the intersection of Rt281 and Brown Hill Rd. Ignore the sign and drive south on Brown Hill Rd. This begins w/a nicely paved section, then broken pavement, and then a knarlier .7 mi stretch. We did this in a front-wheel drive van going slowly and carefully. Some mud and puddles were encountered at the parking site. From there, it's a flat .2 mi walk to the power line and tripoint. See '05 post: http://trekstop.blogspot.com/2005_10_01_archive.html

Flickr pic set:
http://flickr.com/photos/11330680@N06/sets/72157603580986674/
Mason-Dixon Line marker located just south of the pipeline on Brown Hill Rd: http://www.waymarking.com/waymarks/WM1VXH
Other Mason-Dixon western line crossings:
http://www.exploretheline.com/markers.html

MORE BIRDMAN-TYPE FOOTAGE
A new mode for the work commute?

The Highpointers Club only requires the date a state high point was completed. How you got there is a non-issue. So imagine this: You climb to the summit of Whitney and simply don your "wingsuit" then glide down to Lone Pine where you can literally drop in for a beer at Jake's Saloon on Main. Of course, you're wearing a chute which you know when to deploy, and w/o smashing into the east face, on descent. The hot dog in the YouTube video is really pushing the envelope (and buzzing the parking lot) - cool! - which is how you start out, zooming to town, 10,767ft. below.
http://www.youtube.com/watch?v=lWF8KV4IW5o