An unusual round church in London with a Templar past.

A tongue-in-cheek arcade where the games are based on everyday life.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A 30-acre garden inspired by the principles of modern physics.

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

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Famously misunderstood wonder of the ancient world

The world's largest collection of witchcraft regalia.

This South London cemetery holds the remains of more than 15,000 people.

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

The sign at the garden gate reads: "These Plants Can Kill."

These fantastically named natural pools look like something out of a Scottish myth.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A kaleidoscopic warehouse-maze of handmade neon signs.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

The enigmatic sculpture hides above an escalator in a Milan metro station.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

Da Vinci's equestrian statue, 500 years in the making.