UMs: Lost treasure part 2

Again, we find the world is nothing but a big couch to find other people's loose change in. So put on the music again and read on.

The lost city of Z has been long been the thing of legends, but now there is a renewed effort with modern technology:
https://www.reddit.com/r/UnresolvedMysteries/comments/760d4n/drone_technology_could_help_discover_the_lost/

Hidden messages in a song to hint towards a treasure. The only thing missing is satan worship and backwards lyrics:
https://www.reddit.com/r/UnresolvedMysteries/comments/6cefki/clarence_clarity_an_obscure_outoftheordinary/

A golden owl buried somewhere in France that is worth over 1 million francs:
https://www.reddit.com/r/UnresolvedMysteries/comments/2mffmy/in_search_of_the_golden_owl_buried_for_7876_days/

Another European mystery, this time in Hungary called "The Seuso hoard" consists primarily of silver:
https://www.reddit.com/r/UnresolvedMysteries/comments/51yr5b/the_seuso_treasure/

The Lost Dutchman in the Superstition Mountains is a classic, but might as well post a write up for it here:
https://www.reddit.com/r/UnresolvedMysteries/comments/27ckfl/the_lost_dutchmans_gold_mine_peralta_stones_and/