This Vietnamese bar doubles as a multistory labyrinth.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Perhaps the most spectacular grotto along the Algarve coastline.

Legend has it this 11th-century castle was paid a visit from the devil.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Crushed coral and crystals give the sand its signature coloration.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Five candy-colored villages on the Italian Riviera.

Look up from the busy streets to discover how time is kept!

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Banksy gives themself artistic license with this piece of London street art.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

The longest hedge maze in the world.

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

Eighty million natural history specimens call this gargantuan museum home.

Giant, friendly pelicans in Central London, the most unlikely of places.

Pop culture has helped to keep this iconic British building from being destroyed.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

A remarkable medieval structure born from a 14th-century disaster.

This lovely ancestral home inspired the author D.H. Lawrence, and features a tunnel made out of a living willow.

These abandoned coal mine towers near Sherwood Forest might soon boast the U.K.’s longest zip-line.