This tall stone wall with no door and ill-matched windows was built centuries ago, and used as a shelter for domesticated pigeons.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

This ancient castle has been abandoned since the Edwardian conquest of Wales.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

The worst flood disaster in Welsh history might have been a lot worse if it had not happened on movie night.

The decaying ruins of Wales' first asylum for the mentally ill.

The longest and tallest aqueduct in Britain can actually be sailed across.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

Three bridges straddle a stream, one stacked upon the other.

This mural honoring a drowned village has become a symbol of Welsh pride and patriotism.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A colossal aqueduct from the second century B.C., deeply hidden in a gorge on the outskirts of Rome.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

The ruins of a medieval monastery named after a type of tree.

These medieval monastery ruins are surprisingly overlooked by most tourists.

These legendary stone steps were once used to haul coffins up the rockface.

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.

An Italian hillside ghost town.