The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

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

The stately remains of Llywelyn the Great's mighty fortress.

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

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A wunderkammer of mysterious objects and stories.

For nearly 50 years, this San Francisco nonprofit has been serving as a mix of recycling center and art school.

A series of three shiny letters mark the boundary of an old refuge for those being pursued by debt collectors.

Small museum dedicated to the founder of electromagnetic theory.

Another entry into the world of Edinburgh's pop-up artworks.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

This stack of stones honors a murdered 18th-century woman.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

It's a mystery how these curious columns wound up in an Edinburgh suburb.

Neon artworks light up this dark Edinburgh tunnel.

An artist's whimsical transformation of everyday objects.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.