If this was in England it may of been an extended priest hole to hide Catholic Priests after the reformation. If there was an entire chapel hidden away it may of been for said priest to conduct mass for the Catholic household in secret.
You will need a media player that understand mod file formats to play the majority of the music files on the site. They have recommendations per platform in their FAQ.
Yep, one interesting idea about these Amazon sites is that they add corroborating evidence to Francisco de Orellana (the first Spanish explorer to travel the length of the Amazon) that he claimed he had found huge cites with hundreds of thousands (maybe millions) of people living in the Amazon basin.
Presumably by the time later explorers came along 50 years later to verify his claims, the people had all been killed by European diseases like small pox and the jungle had claimed back the cities.
It's LIDAR. It's main benefit for finding archaeology earthworks is that it is possible to remove the vegetation from the results. So anything obscured by trees becomes visible for example.
The Verge article mentions an in-game currency (rupees) so I expect they are going down the 'in-game shop' route. With the option that you grind for the in-game currency or you can just swap real money for game money. Hopefully they wont make this pay to win and stick to just cosmetics. They have stated in the FAQ that they are not doing loot boxes so there is hope.