http://farm6.static.flickr.com/5306/5615569315_1a813cb69c_b.jpg (http://www.flickr.com/photos/dougtone/5615569315/)
Putnam County Route 14 - New York (http://www.flickr.com/photos/dougtone/5615569315/) by dougtone (http://www.flickr.com/people/dougtone/), on Flickr

http://farm3.static.flickr.com/2052/2382971677_3da4b02aef_b.jpg (http://www.flickr.com/photos/taterphoto/2382971677/)
metronorth @ bear mountain (http://www.flickr.com/photos/taterphoto/2382971677/) by taterphoto (http://www.flickr.com/people/taterphoto/), on Flickr

http://farm3.static.flickr.com/2451/3739639316_b40778fb9d_b.jpg (http://www.flickr.com/photos/kelsielectra/3739639316/)
tunnel approach (http://www.flickr.com/photos/kelsielectra/3739639316/) by kelsielectra (http://www.flickr.com/people/kelsielectra/), on Flickr

http://farm5.static.flickr.com/4054/4584764981_df8a9a1882_b.jpg (http://www.flickr.com/photos/29997762@N05/4584764981/)
Erie Otisville Tunnel (http://www.flickr.com/photos/29997762@N05/4584764981/) by R36 Coach (http://www.flickr.com/people/29997762@N05/), on Flickr

Netherlands

It would have been something if there was a railway tunnel through a hill in the Netherlands, but there are simply none of those tunnels. Does this mean that there aren't any tunnels in this low country, no it doesn't. But all the tunnels dive under something that is basically flat like rivers, airports, green fields and city centers.

Her are a few examples of tunnel entrances.

Groene Hart Tunnel

http://farm4.static.flickr.com/3347/3638904985_e6b660b492_b.jpg (http://www.flickr.com/photos/spag85/3638904985/)
HSL Zuid, Groene Hart tunnel portal (http://www.flickr.com/photos/spag85/3638904985/) by Daniel Sparing (http://www.flickr.com/people/spag85/), on Flickr


Schiphol Tunnel

http://farm3.static.flickr.com/2545/3895935871_c6fe3966f5_b.jpg (http://www.flickr.com/photos/38714505@N05/3895935871/)
HS-trein rijdt Schipholtunnel binnen (http://www.flickr.com/photos/38714505@N05/3895935871/) by Frandalf (http://www.flickr.com/people/38714505@N05/), on Flickr

It even goes as far that we just built a tunnel on ground level that doesn't go underneath anything at all.

Barendrecht Noise Tunne

http://img9.imageshack.us/img9/2655/barendrechttunnel.jpg
http://en.structurae.de/photos/index.cfm?JS=42335


btw,

Who wants

Great Belt tunnel:
http://www.hjv.dk/MCMSGhostBilleder/sub_002/Storeb%C3%A6ltBlobServer.jpg

The Øresund tunnel entrance @ Peberholm:
http://upload.wikimedia.org/wikipedia/commons/4/4d/20050319-Peberholm.jpg

Boulevard tunnel, north entrance:
http://multimedia.pol.dk/archive/00495/S-togs_kaos_495841a.jpg

Boulevard tunnel, south entrance (At the far end of the picture):
http://www.cowi.com/menu/service/EconomicsManagementandPlanning/PublictransportandITS/PublishingImages/Vesterport-st-iStockphoto-P5.jpg?wax-srv=SmMwyp6Rtiu2z65T9yL2kQ1A