Blue Hole (Red Sea)
The Blue Hole is a diving location on the southeast Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.
Greenwood Tunnel
The Greenwood Tunnel is a historic railroad tunnel constructed in 1853 by Claudius Crozet during the construction of the Blue Ridge Railroad. The tunnel was the easternmost tunnel in a series of four tunnels used to cross the Blue Ridge Mountains of Virginia. Located near Greenwood in Albemarle County, Virginia, the tunnel was used by the Chesapeake and Ohio Railway (C&O) until its abandonment in 1944. The tunnel still exists, though sealed, next to the old C&O line, now owned by CSX Transportation and leased to the Buckingham Branch Railroad, which runs through a cut bypassing the old tunnel.