Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

Its vast collection of wondrous gadgets details the fascinating history of information technology.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

These quaint French houses dangle precariously over a precipice.

France's highest manned weather station is the only one still inhabited by meteorologists.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

One of the greatest maze designer’s greatest mazes.

The great Danube river starts here.

Walk through a restaurant's refrigerator door to reach this hidden bar.

This abandoned oil depot produces world's longest echo in a manmade structure.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

First LEED-certified gas station in the United States.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.