Try the Ruhr-University Bochum 3D Explorer
HEREInstructions:
W , S = Back and Forth
A, D = Left and Right
Mouse = Look around
Q , E = Turn around
X = Change between walk- and fly-mode
R, F = Rise and Sink (in Flymode)
I = Opens menu and lets you select a Path
M= Opens the Map
Please turn of your Pop-Up Blocker