The Mausoleum

The structure appears to be a gigantic mausoleum or necropolis, dating back around a hundred thousand years. There are no signs of previous looters, so the structure may have been untouched since the chameleon field was erected. The structure's First Chamber is accessible, but an impenetrable door blocks any further progress. Large alien glyphs, untranslated, have been carved into the wall above the door.

The command below will trigger the "The Mausoleum" event in Stellaris:

When this event fires, you can choose between the following option:

• Fascinating.