Berlin: Fence and Gate of former US embassy disappearing
In the first picture the road looks quite normal to me.
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One step ahead, the whole road is a security area:
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You may ask: Why was the whole road blocked like this?
The building on the left side was the former US embassy until 2008. The security measures were removed as soon as the embassy had completely moved to the Pariser Platz building in May 2008.
Mysterious Metal Doors in Washington DC
Mysterious Metal Doors set into the ground next to the northbound lanes of Rock Creek Parkway. Secret escape route from White House? Mobile missile garage?

