There was a top secret plan during World War II to seal a group of soldiers inside the rock.

This octagonal cottage is the smallest and the oldest council house in the United Kingdom.

Protecting the dead from opportunistic body snatchers.

A magician and his beloved, pampered canine were buried together, within days of each other, due to a tragic twist of fate.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Mysterious tombstones thought to be remnants of Atlantis.

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The concrete skeletons of an abandoned Swedish town hide among the trees.

A striking glass tribute to two sisters who suffered during Scotland's "Killing Time."

The curious underground history of keeping Paris clean.

This unusually shaped fortress houses a blend of centuries-old frescoes and modern art.

The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

This incredible second-century sculpture depicts a trio of gods worshipped by the ancient Romans.

The graveyard with the highest IQ in Britain.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

Nestled among the living residents is the final resting place of an apothecary plague victim.

One of the world's smallest prisons boasts just two small cells.