These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Small church on top of a huge rock column.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

Swirling layers of white and red rock earned these mountains their festive nickname.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A miraculous natural phenomenon known as "the spring that breathes."

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Spend the night in this formerly abandoned traditional Scottish village.

This mysterious chalk figure of a horse has been recreated and restored for more than a century.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

This remote stretch of sand is a penguin lover's paradise.

One man's dream has turned into this naturally growing chapel made of almost nothing but trees.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

An intricately carved Viking church overlooks a glistening fjord.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.