An underground city of salt.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

A posh members-only club with a literally dramatic history.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

These quaint French houses dangle precariously over a precipice.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A limestone wonderland of water and subterranean secrets.

Abandoned castle was once a grand example of Russian privilege, built exclusively to win a frivolous bet between noblemen.

A contemporary art installation housed within a Gothic cathedral.

A quick and simple solution to Cambodia's train woes.

This bazaar is one of the oldest in the Arabian world.

Little island known for its massive beachfront "flowerpot" pillars.

America's only nuclear missile silo open to the public.

One of the oldest continually operating drinking establishments west of the Mississippi.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

Seat of the Duke and Duchess of Devonshire for centuries.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A friendly pub with a sordid past in cock fighting.

Two stunning 17th-century libraries and a cabinet of curiosities.

Ruins of a German Castle on top of a towering stone pillar.

The antique barns in Cameron are not painted with your grandfather's Mail Pouch Tobacco murals.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

The chefs at El Diablo use heat generated by an active volcano to cook the food.