Hunt for buried treasure in Nova Scotia.

A centuries-old forgotten underworld lies beneath Malta.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Visit the grave of America's most prominent paranormal investigators and self-proclaimed demonologists.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The commemorative stone column conceals a secret laboratory.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

You won't find these curiously named passageways anywhere else in England.

This single-track road rewards brave drivers with stunning Scottish scenery.

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

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.

Mount Tambora is the site of the largest and deadliest volcanic eruption in recorded human history.

A breathtaking 19th-century trail overlooks Lake Tahoe.

Mine your own precious stones.

This hulking behemoth is actually five interconnected towers built in the 1960s.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Follow the original medieval paths that wind through this intriguing section of the city.