A hugely vast Irish landscape of barren rock that stretches for miles.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

360° views of the city plus five floors of optical illusions and hands-on science.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Ship-sized kinetic sculptural fantasy.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The former headquarters of history's oldest megacorporation.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This cheese shop also houses a museum devoted to Dutch dairy.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A beautifully eclectic mix of architectural styles.

The history and future of cannabis.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.