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Metro tunnel under South Hayes Street
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Forest Glen station
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Escalators at Dupont Circle station, Q Street entrance
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Train stored in the tail track at Huntington [01]
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Train stored in the tail track at Huntington [02]
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Hampton Roads Bridge-Tunnel, westbound tube
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Dupont Circle north entrance [02]
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Dupont Circle north entrance [01]
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Hampton Roads Bridge-Tunnel, westbound [03]
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Hampton Roads Bridge-Tunnel, westbound [02]
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Sign for Exit 268
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Hampton Roads Bridge-Tunnel, westbound [01]
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Hampton Roads Bridge-Tunnel, westbound [05]
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Hampton Roads Bridge-Tunnel, westbound [04]
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Green Line train entering tunnel portal
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Tunnel portal north of West Hyattsville station
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K Street under Washington Circle
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Tuscarora Mountain Tunnel western portal
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Kittatinny Mountain Tunnel [02]
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Kittatinny Mountain Tunnel [01]
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Western portal of Blue Mountain Tunnel
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Tunnel portal outside Addison Road station
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Reconstruction of Connecticut Avenue under Dupont Circle
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Cryptic Room tunnel
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Dupont Circle Q Street entrance
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Wheaton station, inbound side [01]
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Wheaton station, inbound side [02]
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Wheaton station, inbound side [03]
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Fort McHenry Tunnel, Bore 2
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Chain marker in the snow
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Washington Metro chain marker
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Pedestrian tunnel under Queen City Drive
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Anarchy sign painted in Cumberland, Maryland pedestrian tunnel
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Abandoned shopping cart
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Tunnel beneath railroad tracks
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Railroad tracks at Harpers Ferry Amtrak station [01]
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Railroad tracks at Harpers Ferry Amtrak station [02]
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Railroad tracks at Harpers Ferry Amtrak station [03]
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Railroad tracks at Harpers Ferry Amtrak station [04]
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Railroad tracks at Harpers Ferry Amtrak station [05]
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Red Line tunnel between Metro Center and Gallery Place
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Box culvert under CSX tracks
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Winchester and Potomac Railroad Bridge [01]
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Winchester and Potomac Railroad Bridge [02]
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Winchester and Potomac Railroad Bridge [03]
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Winchester and Potomac Railroad Bridge [04]
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Marker graffiti in Harpers Ferry train station tunnel [01]
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Marker graffiti in Harpers Ferry train station tunnel [02]
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Freight train on CSX Cumberland Subdivision track
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Harpers Ferry tunnel portal
Pedestrian walkway on CSX Cumberland Subdivision bridge
Intersection of Shenandoah and Potomac Streets in Harpers Ferry
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Dusty Edwards Genesis fire alarm horn/strobe
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Forest Glen station
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Monitor-Merrimac Memorial Bridge-Tunnel
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Montgomery Village tunnel #11
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Interstate 264 after Midtown Tunnel [01]
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Interstate 264 after Midtown Tunnel [02]
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Interstate 264 after Midtown Tunnel [04]
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Interstate 264 after Midtown Tunnel [03]
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Ilchester Tunnel [01]
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Ilchester Railroad Bridge [01]
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Ilchester Tunnel [02]
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Escalator to upper level at Nauticus
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Selfie at Kittatinny Mountain
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Kittatinny Mountain Tunnel [03]
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Elyse smiles on a bridge overlooking the Kittatinny Mountain Tunnel
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Kittatinny Mountain Tunnel [04]
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Elyse photographs a streetlight [01]
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Elyse photographs a streetlight [02]
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Kittatinny Mountain Tunnel [05]
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DJI Air 2S prior to a flight in Pennsylvania
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Kittatinny Mountain Tunnel [06]
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Kittatinny Mountain Tunnel [07]
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Pennsylvania Route 641 at the turnpike
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Kittatinny Mountain Tunnel [08]
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Kittatinny Mountain Tunnel [09]
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Kittatinny Mountain Tunnel [10]
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Kittatinny Mountain Tunnel [11]
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Kittatinny Mountain Tunnel [12]