Significant Mayan ruin in danger of being lost
El Mirador, a Mayan ruin located in the north of present-day Guatemala’s El Peten region, is in danger of being lost to modern development. A road bringing logging equipment in to harvest the surrounding forest is running roughshod over ruins. In addition, looters remove ancient Mayan artifacts for big profit. El Mirador is especially significant because it harbors evidence of settlement far into the past … as long ago as the 6th century BCE according to the Wikipedia article El Mirador.
For me, any especially ancient pre-Columbian Mayan ruin could be a site visited by Atlanteans in our far distant past.