Earth Years (Gold) - RM Challenge #204 Mystery Cache

This challenge requires you to find 17 earthcaches that were each placed in different years through 2021.  

CuteLilFuzzyMonkey and RetiredGuy have combined to put out the Retired Monkey Challenge Trail. At least one of the two of us has qualified for each challenge. Because we have very different caching styles, it will be very tough for one person to complete all of them. Your progress will be tracked on the leaderboard. As with many good caches, our inspiration for many of these caches came from others, so thank you all!

For all of the caches in this series, we have provided a checker through Project GC to verify whether you have met the challenge. You can also go to the Verification Page to see for which of the challenges you have qualified.

Please use the above link to verify that you have fulfilled the challenge.

Here are RetiredGuy's qualifying stats:

"Find 17 Earthcaches placed in a different year ending with 2021"
2005-09-19 - GCQV5E Hawaii Volcanoes N.P. - U.S. World Heritage Site - (Earthcache)
2006-11-13 - GCZ8H7 The Cologne Cathedral - A Geological Point of View - (Earthcache)
2007-12-10 - GC17WZE Casibari Rock Formation - (Earthcache)
2008-09-09 - GC1G4Z4 Orbitolina!…….Orbitowhat? - DP/EC27 - (Earthcache)
2009-02-13 - GC1MN5Y Les crapauds de l'obélisque de la concorde. - (Earthcache)
2010-04-27 - GC27K4E Montmartre la blanche - (Earthcache)
2011-02-23 - GC2Q1TG Machu Picchu Fault Line Earthcache - (Earthcache)
2012-03-16 - GC3DEMV Rock Stahs! - The Rock Gahden of MoS - (Earthcache)
2013-04-01 - GC48EEB Sculptured Rocks Natural Area Earthcache - (Earthcache)
2014-08-05 - GC5AAWN Chambers Cove - (Earthcache)
2015-03-07 - GC5NZ9A Venice is a "Big Fish" - (Earthcache)
2016-01-16 - GC69DMJ Quincy Granite - (Earthcache)
2017-06-14 - GC779GD Is it Boiling Mud? - (Earthcache)
2018-05-20 - GC7P5RT ECGT "Glacial Erratic" - (Earthcache)
2019-05-11 - GC87P7B Clear and West Forks Confluence - (Earthcache)
2020-03-19 - GC8N0QY Tortola - coastal erosion 🌊 - (Earthcache)
2021-07-02 - GC9DF2T The Importance of Calibration - (Earthcache)
Qualifying 17 / 17, PASSED

You may sign the log before completing the challenge. If you do this, please use a "Write note" log to record your find and then a "Found it" log once you have completed the challenge.

This cache is part of the Retired Monkey Challenge Trail.