Eighty million natural history specimens call this gargantuan museum home.

The ruins of a stone tower with alleged (but unlikely) Roman origins.

The seaside ruins of an ancient salt production facility.

According to legend, this bell once belonged to a kingdom now lost beneath the waves.

Believed to be an execution site used by King Arthur after he was embarrassed.

This tower is all that remains of a once-famed chapel.

The lighthouse is on a island which is connected to another island, which is connected to another island, which is connected to one of the largest islands in the world.

The remains of a 13th-century stronghold built by the Welsh prince known as Llywelyn the Last.

A grand mansion in rural mid-Wales gifted to the Welsh people by two sisters.

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

Legend has it that this stone moves down to the river sometimes to have a drink.

This park is home to a collection of important industrial and religious sites.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.

A holy well believed to have healing powers.

Neolithic burial chambers hidden beside a village school.

This mysterious wheel-cross is the tallest in Britain.

The remains of one of Wales’ great medieval buildings, with a pub in the cellar.

Welsh literary history is preserved in the delicate pages of these medieval manuscripts.

A little-known castle set in a nature reserve.

In 1977, an eccentric book lover formed a micronation for book lovers.

This ancient abbey now lies in majestic ruin behind a caravan park.

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

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.