The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

A unique waterfall that some believe attracts the fairfolk.

These mysterious mazes carved on the rock may be up to 4,000 years old.

The world's largest collection of witchcraft regalia.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

The lake that fills and empties itself at random.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

A stately palace has been converted into the world's largest cannabis museum.

This crumbling Portuguese ruin overlooks the populace it once ruled.

A neolithic tomb converted into a tiny chapel.

Perhaps the most spectacular grotto along the Algarve coastline.

An abandoned anti-smuggling station decays along the boundary between Portugal and Spain.

This Gallo-Roman sanctuary is dedicated to Serápis, god of the underworld.

A small Portuguese cottage formed between boulders in the countryside.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

The ancient sauropod tracks found in this former quarry are some of the largest in the world.

These narrow stone granaries have been used to store and dry out grain for hundreds of years.

A cluster of granite granaries perched on stilts.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.