The now-quiet remains of coastal artillery defenses that were used in both World Wars.

The Isle of Wight’s “Island Line” serviced by former London Underground trains from the 1930s.

A picturesque garden with a surprising past.

Crafted from ocean litter, this sculpture highlights the ills of overconsumption.

A lush oasis full of vibrant plants and striking geometric displays.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

These small, triangular, colorful houses are a staple of Madeira Island.

The oldest of its kind in the country, this tree sits where formerly enslaved people are said to have founded the city of Freetown.

A museum in south England celebrates the amphibious vehicles that cruise on a cushion of air.

The final resting place of one of the most influential modern occultists.

Museum about life, death, and cannibalism in the Stone Age.

Morocco's Argania trees are infested with nut-hungry goats.

Hidden behind mountains in Morocco, a remote town hides a thriving surfing community.

This landmark Victorian folly rewards visitors with spectacular views over the Peak District.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

Pompeii's less famous neighbor is still revealing her secrets.