The photographs below are from the Curiosity rover.
One of these structures might be the weird anomaly that the Curiosity rover discovered a while ago. On the backdrop of one of the photographs, an item that looked like a dome could be seen.
There are stories that there are openings or windows beneath that dome.
Extraterrestrial artifacts or portals to a subterranean base, perhaps?
Another entryway to a probable extraterrestrial facility on Mars may be seen in the video below.