For us, mere mortals, Mars is a no man's land where survival seems like a distant dream. After all, no man has ever walked on its surface (as far as we know) and plans to send one to the red planet are only in the early stages of its development. However, humans have touched Mars through the durable wheels of Mars rovers. We've had 4 successful robotically operated Mars rovers (all of which were managed by the Jet Propulsion Laboratory, NASA) so far: Sojourner, Opportunity, Spirit, and Curiosity. 

As Opportunity's mission was declared complete on February 13, 2019 when NASA lost all contact with the vehicle, Curiosity became the lone survivor on the red planet, rolling over its surface to examine and explore the unknown land all by itself. The spacecraft first landed on Mars on August 6, 2012 and started carrying out its objectives throughout the years. In fact, Curiosity did its job so well and held on for so long that its original mission duration of 687 days was expanded indefinitely. 

Here's how Curiosity looked 7 years ago and now

#1

Ripples On Surface Of Martian Sand Dune

Ripples On Surface Of Martian Sand Dune

NASA Report

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    #2

    Sunset Sequence In Mars' Gale Crater

    Sunset Sequence In Mars' Gale Crater

    NASA Report

    #3

    Curiosity Rover Finds And Examines A Meteorite On Mars

    Curiosity Rover Finds And Examines A Meteorite On Mars

    NASA Report

    #4

    Curiosity's Color View Of Martian Dune After Crossing It

    Curiosity's Color View Of Martian Dune After Crossing It

    NASA Report

    #5

    Martian Rock 'Harrison' In Color, Showing Crystals

    Martian Rock 'Harrison' In Color, Showing Crystals

    NASA Report

    #6

    Curiosity's Dusty Selfie At Duluth

    Curiosity's Dusty Selfie At Duluth

    NASA Report

    #7

    Jake Matijevic Rock

    Jake Matijevic Rock

    NASA Report

    #8

    Multiple Layers Of Mount Sharp

    Multiple Layers Of Mount Sharp

    NASA Report

    #9

    First Sampling Hole In Mount Sharp

    First Sampling Hole In Mount Sharp

    NASA Report

    #10

    Curiosity Took Dozens Of Mast Cam Images To Complete This Mosaic Of A Petrified Sand Dune

    Curiosity Took Dozens Of Mast Cam Images To Complete This Mosaic Of A Petrified Sand Dune

    marscuriosity Report

    #11

    Remnants Of Ancient Streambed On Mars

    Remnants Of Ancient Streambed On Mars

    NASA Report

    #12

    Outcrop In The Murray Buttes Region Of Lower Mount Sharp

    Outcrop In The Murray Buttes Region Of Lower Mount Sharp

    NASA Report

    #13

    Mount Sharp Comes In Sharply

    Mount Sharp Comes In Sharply

    NASA Report

    #14

    Curiosity Self-Portrait At Martian Sand Dune

    Curiosity Self-Portrait At Martian Sand Dune

    NASA Report

    #15

    Curiosity Visited An Area Named "Fracture Town" Which Contains Many Pointed, Layered Rock Formations

    Curiosity Visited An Area Named "Fracture Town" Which Contains Many Pointed, Layered Rock Formations

    marscuriosity Report

    #16

    Having Reached The Base Of Mount Sharp, Curiosity Captured This Image Of Its Rocky Surroundings

    Having Reached The Base Of Mount Sharp, Curiosity Captured This Image Of Its Rocky Surroundings

    marscuriosity Report

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    #17

    Wheel Scuff Mark At 'Rocknest'

    Wheel Scuff Mark At 'Rocknest'

    NASA Report

    #18

    Focusing The 100-Millimeter Mastcam

    Focusing The 100-Millimeter Mastcam

    NASA Report

    #19

    Curiosity Arrived At This Active Sand Dune Named "Gobabeb", Which Is Part Of A Larger Dune Field Known As "Bagnold"

    Curiosity Arrived At This Active Sand Dune Named "Gobabeb", Which Is Part Of A Larger Dune Field Known As "Bagnold"

    marscuriosity Report

    #20

    View From Mars Orbiter Showing Curiosity Rover At 'Shaler'

    View From Mars Orbiter Showing Curiosity Rover At 'Shaler'

    NASA Report

    #21

    Mars Rover Curiosity In 'Buckskin' Selfie

    Mars Rover Curiosity In 'Buckskin' Selfie

    NASA Report

    #22

    Layers At The Base Of Mount Sharp

    Layers At The Base Of Mount Sharp

    NASA Report

    #23

    Getting To Know Mount Sharp

    Getting To Know Mount Sharp

    NASA Report

    #24

    Curiosity Tracks In 'Hidden Valley' On Mars

    Curiosity Tracks In 'Hidden Valley' On Mars

    NASA Report

    #25

    Curiosity Rover's View Of Alluring Martian Geology

    Curiosity Rover's View Of Alluring Martian Geology

    NASA Report

    #26

    Curiosity Self-Portrait At 'Windjana' Drilling Site

    Curiosity Self-Portrait At 'Windjana' Drilling Site

    NASA Report

    See Also on Bored Panda
    #27

    A Mudstone Rock Outcrop At The Base Of Mount Sharp

    A Mudstone Rock Outcrop At The Base Of Mount Sharp

    marscuriosity Report

    #28

    Bone Up On Mars Rock Shapes

    Bone Up On Mars Rock Shapes

    NASA Report

    #29

    Strata At Base Of Mount Sharp

    Strata At Base Of Mount Sharp

    NASA Report

    #30

    Resistant Features In 'Pahrump Hills' Outcrop

    Resistant Features In 'Pahrump Hills' Outcrop

    NASA Report