What on Earth? - Season 11

Satellites capture a bizarre industrial complex in desert of Kazakhstan.

Satellites capture dozens of parallel lines hidden in Polish woodlands.

Satellites capture bizarre structures on the Greek island of Kefalonia.

Satellites capture ruins amid bizarre structures on a Welsh mountaintop.

Satellite images capture a triangular castle-like tower located on the Mediterranean island of Sardinia; experts investigate the relics of a declining ancient civilization that may have suffered a celestial catastrophe.

Satellite images capture two conjoined circular structures embedded in the lush and rolling landscape of Ireland; experts investigate and uncover an ancient site linked to legendary figures and the elusive hunt for the Ark of the Covenant.

Drone images capture oddly shaped towers in a forest clearing near Moscow.

Satellites capture a series of zigzagging patterns in Polish woodlands.

Drone images capture enormous holes scattered along the Dead Sea coastline.

Satellites capture bizarre markings etched deep in the mountains of Spain.