Yeah, tree tunnels--why not! Here's one from the Wild Goose Trail, WI.

http://bikeforums.net/attachment.php...hmentid=416235

On Silver Comet Trail, the Brushy Mountain Tunnel. This is a splendid place in the hot summer. It feels like a refrigerator in there on a hot day! The tunnel is 800 feet long and was originally a railroad tunnel built around 1900 or so.


http://bikeforums.net/attachment.php...hmentid=416239

Overnight Camping at Brushy Mountain | Walter's Little World

Paw Paw Tunnel
 

Nice tunnels folks, but my favorite is the Paw Paw Tunnel on the C&O canal towpath trail. It's 3118 feet long, without lights and you share it with the canal. You have to stay on a narrow path alongone side of the tunnel. Most people walk their bikes through it, it can be ridden.

It's along a very scenic trail that runs 185 miles between Cumberland MD and Washington DC.

I can't seem to attach any pictures, but it's worth the journey

I finally got a picture to upload!

Gorges de Daluis, Alpes-Maritimes France. Pictured is Dutch world cyclist/lecturer, Frank Van Rijn who I met and travelled with on the trip in 1987.............


http://i977.photobucket.com/albums/a...ankVanRijn.jpg


http://i977.photobucket.com/albums/a...esdeDaluis.jpg

Outside the Big Savage

http://bikeforums.net/attachment.php...hmentid=416289

Otago Rail Trail, New Zealand. Pitch black in the middle of the tunnel, and a bumpy surface. I started out riding it, but quickly lost all sense of direction, so pushed the rest of the way.

It's a really amazing trail, passing through some stunning countryside. They filmed parts of Lord of the Rings just up the road.

http://bikeforums.net/attachment.php...hmentid=416297

Not sure why the picture is there twice. Apologies.

Been there, done that, took the photo. ;)

http://bikeforums.net/attachment.php...hmentid=416397

Is this it?

http://bikeforums.net/attachment.php...hmentid=416409

I think so, but I think the other end is more photogenic.

http://bikeforums.net/attachment.php...hmentid=416433

Nice waterfall! Looks like you've got the picture posting process worked out.

And let's not forget the tiny tunnels like this hole in the wall on the Glacial Drumlin Trail, WI:

http://bikeforums.net/attachment.php...hmentid=416436

More Paw Paw. Into the darkness.
http://i1082.photobucket.com/albums/...s/photoco2.jpg

Both of these are from the Caha Pass in Ireland:

The top of the pass, going through to the other side. Single lane tunnel - luckily cars honk before entering (and there is very little traffic when I was there).
https://fbcdn-sphotos-c-a.akamaihd.n...139919804c9f65

Getting up the pass (North to South) you pass through a series of these little ones. Luckily two lanes wide.

https://scontent-b-dfw.xx.fbcdn.net/...a0&oe=54E634DA

Another tiny tunnel on a rails-to -trails path in northern Michigan.

http://i783.photobucket.com/albums/y...18577a6411.jpg

Tunnel du Bois Clair on a rail-trail in southern Burgundy, France. It's about 1 mile long and is closed in the winter to protect a bat colony which has taken up residence.

http://bikeforums.net/attachment.php...hmentid=416454

Tourist in MSN,
Right about where your bike is parked in that one photo is where I slammed into that big stone wall. It was raining so hard that when I came out of the tunnel (way too fast mind you) that I hit those slippery wooden planks and slid to the right and planted my front wheel right into the wall. With some work I got the wheel straightened out well enough to ride on but I spent the night in a hotel room tearing down and truing my front wheel so I could make it ride-able the rest of the way. For some reason I don't remember it being that scenic :(

A rails- to- trails route just north of Valencia on the coast of Spain. A local directed us to the 20- 30 km path, and saved us some major climbing.

http://i783.photobucket.com/albums/y...1e950f04a7.jpg

http://i783.photobucket.com/albums/y...cc725b6bb5.jpg

I had a similar experience with long tunnel that was curved so that you couldn't see the "light at the end of the tunnel." It was an incredibly deep blackness that seemed to swallow up the meager illumination of my bike light. I had imagined I could cycle right through, but after about fifty feet, I was completely disoriented and had to walk my bike the rest of the way. As I walked, I kept having the unsettling feeling that "something" was about to emerge from the tunnel's walls and come after me.

[QUOTE=arfer1;17284528]Is this it?

That is most defiantly if. I have no opinion as to which side is more photogenic. It has quite an interesting history to it, and one can only marvel at the effort and craftsmanship that was require to build it.

I don't remember the name of this tunnel, bu it is one of two along the Greenbrier River trail in West Virginia. It's a couple of hundred feet long and very dark. Stay central when riding through it as the edges are quite rough. The Greenbrier River trail runs 80 miles, most of which is along the banks on the Greenbrier River. http://bikeforums.net/attachment.php...hmentid=416693

I like tunnels! Route of the Hiawatha rails to Trails this past September, ten tunnels (One closed but you go through the long one twice):
http://bikeforums.net/attachment.php...hmentid=416695http://bikeforums.net/attachment.php...hmentid=416696http://bikeforums.net/attachment.php...hmentid=416697http://bikeforums.net/attachment.php...hmentid=416698http://bikeforums.net/attachment.php...hmentid=416699
John

Major bummer on slipping on the wet boards. I walked my bike thru the tunnel and by the time I got to the end, the batteries in my flashlight were almost dead. I had accidentally left it on earlier. Maybe that is why I thought it looked so nice, I was really happy to get thru before the batteries completely died.

I read of a Corkscrew tunnel, quarried out, in Norway. https://www.youtube.com/watch?v=aG-B659WZfY
This one is straighter https://www.youtube.com/watch?v=zeB8Y4fVI3g

Sometimes they are not so glamorous. This tunnel passes under I-90 west of Butte, MT. It's an actual roadway that connects two other frontage roads, but it allowed me to avoid riding on the highway.

http://bikeforums.net/attachment.php...hmentid=416859