Ancient mysterious ruts carved in the bedrock.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

These temples are among the oldest free-standing stone buildings in the world.

In the sleepy town of Gozo exists a reproduction of the entire town of Bethlehem.

A motley, fantastical agglomeration of unlikely houseboats along the Shoreham-by-Sea riverbank.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This church is named for one of the most dramatic tales in the early Christian church.

The eclectic seaside sanctuary caters to a rather fowl crowd.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.