One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

A winding, blood-red tunnel of hardened lava navigable by foot.

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

A sulfuric martian landscape that looks far better than it smells.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

Geothermal waterfalls in Tuscany.

The Cape of Good Hope is not quite as low as you can go on the African continent, but it's still geographically significant.

A contemporary art installation housed within a Gothic cathedral.

Part ski resort, part modern art space, this lodge brings giant metal spiders and bloody doors to the Austrian Alps.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

Bacteria and algae give the salty water its bubblegum hue.

An enchanting landscape of ancient sandstone structures eroded into otherworldly shapes.

This abandoned gold mine found a second life as a post-apocalyptic film set.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

This abandoned naval battery stood at the ready as recently as the 1980s.

Largest cave system in Africa.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.