This great stone guardian of the forest is a relic from the land's volatile volcanic past.

An ingenious solution to a tricky engineering problem, this spiraling bridge takes drivers for a dizzying spin.

The site of the first medieval crusade that pitted Christians against Christians.

Historic medieval fortified city in southwest France.

This abandoned lock-up was saved because of its connection to a local football team.

Its dark depths conceal millions of rare, delicate crystal formations.

A charming Spanish village sits atop this natural limestone overpass.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

These free-roaming horses were once destined to disappear from the land.

This amazingly preserved Doric temple was abandoned before it was ever completed.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

An architect transformed this abandoned cement factory into his castle-like workshop.

Just a man taking his prehistoric pet for a stroll.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.