For the wonder there is not much material to use. You could use a early iron age burial mound with maybe a small stone circle surrounding it, though it is a bit outdated. Specific name could be Kuningasgrabaz (Royal Grave, i searched early germanic words on wiktionary.)
Para la maravilla, no hay muchas referencias para usar. Podría usar un túmulo de la edad de hierro quizas un pequenõ circulo de piedras rodeándolo.