This is the Washington Monument on the National Mall in Washington, DC.
This 'small from the outside-big from the inside Museum', designed by Frank Lloyd Wright contains beautiful art from as well contemporary artists as the old masters.
Due to the circular architecture the exhibited art is seen in a continuous flow walking down or up the 'spiral'.
Everywhere on this planet you will find streetsigns. Simple graphic images that will point out a danger that is ahead or acts that are forbidden.
Greenwich is a short trip from Central London and allows you to take a break from the city and take in some few hundreds of years of history as well.