The Lagosteiros Natural Monument, near Cape Espichel, in Sesimbra, Portugal, is a Portuguese protected area created in 1997, consisting of dinosaur trackway ichnites.

[2] The Lagosteiros site is included within the Lusitanian Basin and is the most recent dinosaur track site in the Cabo Espichel region, having been formed approximately 130 to 120 million years ago, during the Early Cretaceous, when the western margin of Portugal had flat, marshy and muddy terrains.

[3] Due to the strata's northwards dip, and the cliff walls that further rise above the site to the east, the best time of the day for visiting is during the afternoon, when the Sun strikes the rock bed at a good angle, shading the tracks in contrast with the illuminated rock, as seen in the photographs here.

During a short period around the winter solstice, the Sun will not rise high enough in the sky to illuminate the natural monument, leaving it shaded.

Among the numerous tracks, a long main trackway stands out with large footprints, attributed to a bipedal animal.