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

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

An unexpectedly extraterrestrial room in a former Victorian resort club.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

You can soak in three relaxing pools filled daily by the tide.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

This repurposed church offers a more literal way to get closer to the heavens.

Andrew Carnegie funded the building of almost 3,000 libraries across the world, this was the first.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

This gorgeous space is England's largest independent library outside of London.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

The world's spiciest ice cream comes from Glasgow.

This museum honors the young maritime hero who became an unexpected Victorian-era celebrity.

This waterfall is one of the most spectacular natural features in the Scottish Lowlands.

Where condemned pirates met their grisly end at the gallows on the River Thames.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.