Berlin's Pergamon Museum
Altar of Zeus.  It comes from the Acropolis of Pergamon in
what is now Turkey. The Germans took the whole thing in
the 19th century, and named this museum after the
Greco-Roman city where the altar used to stand.  A few loose
bricks from the Altar of Zeus foundation are all that remain
in Pergamon.  I was there.
This may be the largest single structure Europeans removed
from the ancient world and placed in a public museum.
Another look at the Altar of Zeus, which is so massive I
could not photograph the entire altar.  The Altar of Zeus is
estimated to be more than 2,000 years old.   
The Pergamon Museum also has an extensive collection from
Babylon, in what is now Iraq.  This panel is from the Palace
Throne Room.  The Ishtar Gate is part of the display, but was
blocked by scaffolding, preventing a decent picture.
Lions parade at the base of Babylon Throne Room panels.  
The Pergamon Museum's Babylon display is estimated to
be 2,500 years old, from the reign of Nebuchadnezzar II.
If you have a high speed internet connection, watch the
Intrepid Berkeley Explorer's 2003 Germany video by clicking
and the 1990 film by clicking here: Berlin and Paris
And there now is the 2016 video that begins in Bavaria with
Munich's beer party, which you watch by clicking on: