Fallen Astronaut Memorial/Space Mirror Memorial

Bearing the names of eight Americans and six Soviets who lost their lives in the advancement of space exploration. Its location is ON THE FREAKING MOON. 
Said to be the "First Art in Space" (are we calling memorials art?), it was installed in 1971 by the crew of Apollo 15. A 3" sculpture of a face-down astronaut lies on the surface of the moon, created by Belgian artist Paul Van Hoeydonck. Maybe this one is art, as it has a replica in the Smithsonian's Air and Space Museum.

Not everyone who lost their lives up to that point is on the plaque, due to secrecy or other reasons there are two Soviets and two Americans whose names are not mentioned.



Luckily, there is also the Space Mirror Memorial, where the two Americans left out above find themselves memorialized. Located at John F. Kennedy Space Center on Merrit Island, Florida, this memorial is composed of 90 panels of black granite, with the names of 24 astronauts killed during human spaceflight missions or training. 

This Astronaut Memorial was designed by Wes Jones of Holt Hinshaw Pfau Jones and was commissioned after he won an international design competition.

But seriously, if you can't come up with a site I highly suggest placing your monument ON THE MOON.