Looking for books where an alien/ancient/unexplainable structure is explored

I am looking for books similar to "At the Mountains of Madness" by H.P. Lovecraft(ive pretty much read everything from lovecraft), "Eversion" by Alastair Reynolds, "Das Eulentor" by Alexander Gruber (dont know if this book ever released in another language), "The Hollow Places" by T. Kingfisher, I also tried reading "Ascension" by Nicholas Binge but it wasnt really to my taste. Hope you have some ideas. thx in advance