Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

This amazing trail among the many waterfalls around Ingleton has been enchanting visitors since 1885.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

This natural sea arch highlights Ireland's rugged coastal beauty.

This 1920s Dutch barge is now a floating bookstore.

The last manually operated turntable ferry in the world.

It's always game time at Stockholm's only museum devoted solely to video games.

A charming Spanish village sits atop this natural limestone overpass.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

This fairytale-like structure is the last turf church ever constructed in Iceland.

Scotland's only funicular railway is also the United Kingdom's highest.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A medieval military street hidden beneath a charming French fishing village.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A sliver of nostalgia in Seattle's Viretta Park.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.