NASA dropped Curiosity Rover on Mars year 2012. Since then Curiosity has been hiking and capturing photos like a savvy traveler.
NASA partnering with Google enabled visiting Mars with new hyped technology Virtual Reality. Virtual Reality creates near real visual experience and more actual engagement.
Project is ready for general masses at https://accessmars.withgoogle.com/
With Access to Mars project Google and NASA creates virtual Mars with images taken by Curiosity Rover. However few images are gray and others are full RGB. Mostly due to Curiosity does not need to take high quality images all the time and skimming can be performed with enough accuracy with low accuracy. You can travel Mars with similar experience to Google Street View or access Curiosity's mission locations by clicking on specific icons.
Check it out again at https://accessmars.withgoogle.com/